Having reviewed several of the many modern .458-caliber cartridges on the previous page,
this question comes foremost to my mind:

Barring James Watts arising from the grave and claiming Winchester stole the .450 Watts Short
(throating details on the .450 Watts Magnum and .450 Watts Short are unknown),
since 1955 A.D. origin of the .458 Winchester Magnum prototype, has there been any .458-caliber sporting rifle cartridge created
that was not a solution for a nonexistent problem ?
Can anybody name just one ?
I don't think so.
I dare anyone to try.
It will be a very lopsided "town hall" with a clear victory.
Like President Trump hitting the fastballs over the fence, center field, home runs at hardball baseball,
while Joe "Hiden" Biden strikes out at tee-ball and gets a participation trophy.
Joe needs a new wardrobe.
Orange jumpsuits would be nice, with a matching set of leg irons and manacles as fashion accessories.


.458 Winchester Magnum Perfection
In maxima potentia parvum spatium.
Id venit et vicit omnis.

Rip,
You need to take Pity on Joe. Within 3 months either way of the election, he will be the most miserable Swamp dweller by a long shot. He has no destiny except to be overrun, overthrown, or just plain forgotten in the Home.
Maybe there is a nice facility in Ukraine that will take him. He was/is well invested there.
Hunter Biden, Burisma,
and Corruption:
The Impact on U.S.
Government Policy and
Related Concerns
U.S. Senate Committee on Homeland
Security and Governmental Affairs
U.S. Senate Committee on Finance
Majority Staff Report
(taken from the Conclusion section)
The records acquired by the Committees also show that Hunter Biden and his family
were involved in a vast financial network that connected them to foreign nationals and foreign
governments across the globe. Hunter Biden and Devon Archer, in particular, formed significant
and consistent financial relationships with the corrupt oligarch Mykola Zlochevsky during their
time working for Burisma, and their firms made millions of dollars from that association while
Joe Biden was vice president and the public face of the Obama administration’s Ukraine policy.
Rosemont Seneca Thornton, an investment firm co-founded by Hunter Biden, received $3.5
million in a wire transfer from Elena Baturina, who allegedly received illegal construction
contracts from her husband, the then-mayor of Moscow. Moreover, Archer’s apparent receipt of
money for a car from Kenges Rakishev of Kazakhstan while Vice President Biden was in Kyiv is
especially concerning in light of the timing. And finally, Biden and Archer’s work with Chinese
nationals connected to the Communist regime illustrate the deep financial connections that
accelerated while Joe Biden was vice president and continued after he left office.

Fury01,
Yes, and that is just the tip of the Biden iceberg ! The rest is still hiden and needs to be exposed,
Democrat deniers be damned !
A parallel exists between truth and lies similar to the naysaying against the .458 Winchester Magnum.

So the .458 Winchester Magnum trumps all.
Nobody wants to argue that anymore.
The demonrats have jumped ship and the .458 Winchester Magnum sails on, never inadequate, just getting better for the last 65 years.
It can always beat a .458 Lott if it is allowed the same action length and pressure.
And it is so much more adaptable to lesser power levels if desired.
WINning !

Before we get too deep in the weeds on either side of the Mach-1 ditch ...

... Like is Trail Boss a dirty powder that needs some grease lube like BP ?
Could one use grease lube on the 4 or 5 grooves of a monometal copper TSX or T6 and shoot them subsonic with Trail Boss ? ... To be continued ...

We should first review some standard SAAMI .458 Win.Mag. loads, lest we lose sight of how thoroughly practical it is, with all kinds of powders.
Not just Western's AA powders, but Hodgdon and IMR loads aplenty are excellent.
A sample is available at the Hodgdon site ...


www.hodgdonreloading.com/data/rifle

This data is great for its legibility and includes barrel length (24") and pressures, even if they are by the old method of CUP.
Consider 53,000 CUP = 60,000 PSI for the .458 Winchester Magnum.
The approximation
PSI = CUP X 1.132
is OK here.

Now to get into the weeds with Trail Boss loads:

And reduced loads with H4895, start with
60 per cent of your usual maximum load for any given bullet. Filler not required, but probably would improve uniformity or accuracy:



H4895 is another one of those modern wunderpowders !

I have one load of H4895 that uses 87 grains for 110 % LR/filling, compressed.
I suppose the prudent thing would be to reduce that charge to 52.2 grains and work back up.

Deeper into the weeds:

At www.ammoguide.com this load is listed for the .458 WinM!:
720-gr Ranger Rick FNGC, COL 3.592"
IMR-4895 50.0 gr
24" barrel, Ruger No. 1
1467 fps MV

At www.ammoguide.com this load is listed for the .45-70 Government:
730-gr NEI FNGC, COL 3.020" (BOL 1.737")
H-4198 35.0 gr
10" barrel, BFR revolver
1365 fps MV

Alliant Blue Dot looks promising for subsonic with 600-grainer at 3.000" COL in either 19.7" barrel or 25" barrel.
Chopping the barrel by 5" only loses 39 fps in QuickLOAD.
About 7.4 fps loss per inch of barrel loss from 25" to 19.7".
Fast powder and heavy bullet, in other words,
results in little velocity gain as barrel is lengthened from 20" to 25".
A fringe benefit of being in the weeds.
Ditto Hodgdon Lil'Gun: 100% burn with ~50% LR/fill, and pressures at Trapdoor levels,
for subsonic 600-grainer in 20" or 25" barrel.

.458 Winchester Magnum Perfection
In maxima potentia parvum spatium.
Id venit et vicit omnis.

Further into the weeds, coming into the long grass now,
once upon a time there was a company called NEI Handtools, Inc.
Here is a page from the 19 pages comprising their January 2008 price list and catalog:



Zoomed in on the page 12 above, far right and fifth bullet down, here is the "730-grainer" for the .45-70 Govt. BFR revolver load at 3.020" COL:



For 1.737" BOL and 730-gr/ .458-caliber,
at 550 fps MV, required twist is 1:10" or faster,
at 1080 fps MV, required twist is 1:14" or faster,
at 1100 fps MV, required twist is 1:14.1" or faster.
You have to get it going 1800 fps MV to stabilize in a 1:18" twist.
With 1:14" twist subsonic is treading a fine line.
No wonder most of the .458 Win.Mag. youtubers shoot them supersonic.

A 1.7"-long lead bullet must work pretty well in a 1:14" twist, probably used mostly for .458 Winchester Magnum lead spear chucking.

I think Ranger Rick's Bullets made a bullet much like the NEI, until he sold out to Matt at Matt's Bullets.
Manly men can buy them ready-made and ready for chucking:



Weird-long gas check base on the Matt's bullet, needs some more lube on it.
In summary, I think a 600-grainer is plenty for chucking across the ditch.

.458 Winchester Magnum Perfection
In maxima potentia parvum spatium.
Id venit et vicit omnis.

Jeffrey Kelley shoots the Matt's Bullets 730-grainer from a 22"-barreled 1964 vintage M70 .458 Win.Mag.:

https://www.bing.com/videos/se...D3BDD4997A&FORM=VIRE

Starting load, 52.0 grains of H4895 >>> 1349 fps

Loaded to SAAMI spec, shortCOL,
except for pressure on his last shot, that was way over 60,000 psi.
He blew a primer and had a sticky bolt at 60.0 grains of H4895.
Stopping at about 55.0 grains would have been a good idea.
His chrono error readings may have been from having chrono too close to muzzle,
or from the muzzle blast of adjacent shooter at the public range.

Good'ol FortuneCookie45LC gives us a nice subsonic .458 Win.Mag. load with a
neat little bullet, the NOE 459-500 HTC:

16 grains of Unique with Dacron filler >>> 1083 fps for this "500-grainer" from a 24" barreled M70 Classic.
5-shot ES = 21 fps
5-shot St.Dev. = 8 fps
5-shot group less than an inch at 50 yards.
He used Eastwood powder-coat paint and sized the .462"-diameter as-cast-and-painted bullet
with a .458" Lyman sizer.
It was a hardcast (BHN 22) and sprang back to .459".
Probably would have been even better if he had sized it to .461".

Speaking of the NOE HTC bullets, I now have a mould for the 600-grainer:





It includes a set of FN pins and 3 sets of hollow-pointing pins, for short, medium, and deep hole in nose.
Hubba hubba.

.458 Winchester Magnum Perfection
In maxima potentia parvum spatium.
Id venit et vicit omnis.

Rip,
I knew once you conquered Powder coat, there would be no holding you back. Well done!
Flat Points forever!!

Fury01,
Buy a donkey.
I have finally arrived at heaviest FN needed in a .458 WIN.Mag.
And I have crossed over into hollow-pointing that FN by some divine providence, I hope.
FN nose stud should produce about 600-grainer with GC and PC paint and be about 1.46" long.
The slick sides keep it short.
The 0.600"-depth HP nose stud will remove 33 grains of WW alloy, according to NOE.





Funny that I cannot find a drawing at NOE that features hollow-pointing on the GC version like mine.
I thought I was ordering the plain FN GC version off the shelf like this ...



... but I got the kitchen sink thrown in somehow, and that is OK.
Otherwise I might not have taken the HP initiative.



The shorter HP depths are 0.300" and 0.100",
with 0.200" HP hole diameter at start of taper.
That shortest one will simply put a dimple on the center of the FN meplat.
Here is the backside/bottom of the mould showing how the studs are secured, a 1/8" hex key takes care of every fastener on the mould
except that little sprue plate post gibb:



The 0.600"-depth HP will make the gas-checked, powder-coat painted version weigh about 570 grains.
We have arrived again at the .461 Gibbs target-bullet weight
which worked so well on 1000-yard targets and big game, near and far,
at mildly supersonic velocity in the ultimate BPCR.
Powder-coat paint is the new "full patch" paper patch.

.458 Winchester Magnum Perfection does it again.
Onward to page 461, for THE MISSION.

.458 Winchester Magnum Perfection
In maxima potentia parvum spatium.
Id venit et vicit omnis.

Fantastic piece of equipment. Dimple in the flat point sounds far from Pointless...
A tiny bit of upset helps keep that bullet pointed straight ahead!

quote:

Originally posted by Fury01:
Dimple in the flat point sounds far from Pointless...

I once shot a buck in my long johns. What he was doing in my long johns, I will never know.



Second trip to Kodiak it was.
Arose from my little dome tent on a frosty morn, crawled out to take a leak and there was the buck about 50 feet away.
So, dressed in long johns I crawled back into tent and retrieved the .375 Weatherby Whitworth Mark X and shot him from just outside my tent flap,
in the long grass, in my long johns.
Navy blue polypropylene long johns.

Then I answered nature's other call.
I had great bladder control back then.
I dressed up in my other kit to pose with the buck,
including Bianchi Ranger Rig with Freedom Arms .454 Casull under my left arm, and my tundra tennis shoes, hip waders.
It was Kodiak afterall.
Great start to the day.

That .375 WBY Mauser was my first foray into getting rifles built.
That is it above, a rechambered .375 H&H in a naked fiberglass Brown Precision stock, circa 1987.
Also had a Ruger No. 1 quarter rib added to the barrel for backup scout scope.
Primary scope was a Leupold 2.5-8X36mm.
I need to turn it into a switch-barrel with a .458-caliber barrel.
Thinking of experimenting more with fast twist.
Going from 1:14" twist to 1:7" twist might raise pressures or lower velocity by less than one-half per cent.
A 1:10" twist is no excuse for a .458 Lott to have high pressure and low MV.
Throat throat throat.
A .458 WIN+P+L with a 400-grain T6 at 2600 fps would make a fine Kodiak deer rifle.

I saw a "13-foot" bear on that trip, glassed from a mile away.
Got to within 300 yards of him before he spooked and ran into the willows.
He had been lying on the hillside with his head on his paws like a giant dog,
watching the wall tent of two deer hunters 50 yards below him.
They never knew he had been there until we told those good'ol boys about it.
They were bowhunters and had one .300 Win.Mag. rifle between them.
We might have "saved" them by barging in on them while they fried bacon for breakfast.
Saved their bacon from that bear maybe.
I wished them peace.



Above is the first portrait by a 19-year-old self-taught boy in Kentucky.
It is not a self portrait, but was copied from looking at the frontispiece plate in the family Bible.
The oil on canvas has not faded in over 46 years,
it was kind of ghostly to start with.
It reminds me:
Yay, though I walk through the Valley of Jap Bay on Kodiak Island, a .458 Winchester Magnum shall comfort me.
The Lord helps those who help themselves to a .458 Winchester Magnum.
Jesus prefers the .458 Winchester Magnum over any other .458-caliber rifle.

You see, everything can be made to be about the .458 Winchester Magnum, for THE MISSION.


.458 Winchester Magnum Perfection
In maxima potentia parvum spatium.
Id venit et vicit omnis.

McGowen Precision Barrels

Bore .450″ | Groove .458″
Twists Available:

1-8″ (8 Groove)
1-10″ (8 Groove)
1-14″ (6 & 8 Groove)
1-16″ (8 Groove)
1-18″ (8 Groove)
1-22″ (8 Groove)
1-24″ (6 Groove)

1:8" twist would be perfect for a 2.5"-long bullet of brass monometal in the .458 WinM! at velocity of 940 fps or greater.

Pac-Nor also makes an 8" twist for the .458-cal rifle:

458 Rifle (0.458")
3 groove 13" 14"
6 groove 8"
8 groove 10" 14" 15" 18" 20" 22" 26"

I confess I haven't read every post in this thread, but my one real question is: "How many different mainstream (Remington, Winchester, Hornady, Barnes, Swift) factory rounds have been chrono'd by the posters with 500 or 510g bullets? A lot of people that shoot these probably aren't handloaders.

chuck375,
You have some reading to catch up on.
Rest assured, plenty have been tested.
Hornady delivers their advertised 2140 fps with 500-grainers from a 24" barrel, their "Superformance" loads.
Those are easily duplicated by the handloader with AA-2230 and other powders.
Their old "Heavy Magnum" loads were advertised at well over 2200 fps,
but when I tested them in my old 24"-barreled rifles long ago, they were delivering just under 2200 fps with 500-grainers.
Easily outdone by the handloader.

Rifles do vary, I think mainly in whether they have .459"-diameter grooves (most common) or .458"-diameter grooves, the SAAMI minimum.

Winchester and others were most recently stuck on 2040 fps with 500 to 510 grainers, do not even know if they are still loading them.

Nowadays, any shortfall in velocity may be attributed to manufacturers downloading for the timid,
well within SAAMI restrictions of 3.340" COL and 60,000 PSI.

It does everything the old 6.5 Swede can do with less case capacity in the PRC, and higher pressure.



If I still suffered from wildcatitis relapsing fever, I would do the .458 WIN-PRC 2.1" with an 8" twist barrel,
in a standard, .30-06-length action, of course.
Might as well do the .458 WIN-PRC 2.5" in a .375 H&H-length action with whatever twist too,
even though it offers little over the .458 WIN+P+L,
but it might stack and feed slightly better than a simple neck-up to .458/.416 Ruger, the .458 WIN Ruger.

The PRC brass is approved for higher pressure than even the .458 Lott,
why, it has the same SAAMI MAP as the .416 Remington Magnum: 65,000 psi.

"The Sporting Arms and Ammunition Manufacturers’ Institute (SAAMI®) has accepted two new Hornady-marketed cartridges, the 6.5 Precision Rifle Cartridge (6.5 PRC) and the 300 PRC. Notably, for both cartridges, SAAMI lists a Maximum Average Pressure (MAP) of 65,000 PSI. The 300 PRC is NOT just a necked-up version of the 6.5 PRC."
(distance from breech face to shoulder is longer for the .300 PRC, 1.643" instead of 1.587",
and max brass length is 2.100" for the .300 PRC, 2.030" for the 6.5 PRC)

High pressure is how the 6.5 PRC can compete with the lower pressured 6.5 Swede.
Ditto the .416 Remington Magnum and the .416 Rigby.

.416 Remington Magnum brass is best used for making .458 Winchester Magnum brass if you want 400 grainers at better than 2400 fps at much lower pressure.
Throat throat throat.

.458 Winchester Magnum Perfection
In maxima potentia parvum spatium.
Id venit et vicit omnis.

Ron,

I have been absent from mission duty but I have a valid excuse My AR log in system was stuffing up and needed Don's attention.

Mike,
Did Don stuff you before he unstuffed you ?
He stuffed my signature function about 2010,
after I reposted a picture of Obama dressed as a witch doctor, using it as my signature.
Funny thing is, I got that image from Saeed,
a man with a great sense of humor.
Damnedocrats (C) have no sense of humor,
and no common sense at all.

quote:

Originally posted by RIP:

after I reposted a picture of Obama dressed as a witch doctor, using it as my signature.

That would have almost killed a lefty like Don

Mike,
There is indeed a great analogy between the Damnocrat (C) attacks on Trump
and the Lottite attacks against the .458 Winchester Magnum.
Both are agenda-driven lies amounting to similar derangement syndrome severity,
i.e., total failure in reality testing. Insane or evil or both.

One of the most laughable of Lottite confabulations you will read on the internet
and hear told on Youtube videos,
by armchair experts:

In 1959 in Mozambique, Jacques P. Lott shot a cape buffalo with his .458 Winchester Magnum M70 African rifle.
He was using Winchester factory ammo.
The shot only angered the buffalo, bouncing off the hide overlying the vital area of chest.
The buffalo was stung as if by a bee, and took it out on Jack, making him float like a butterfly into the bushes.
Jack was saved only by PH Wally Johnson coming to his rescue.
While recuperating, Jack dissected a factory round and found clumps of compressed and congealed ball powder inside,
and bullets that were loose in the cases and would twirl with light touch of his fingers,
except for some that had been snugged by Elmer's Glue at the factory.
He chronographed them and some rounds were squibbs that left clumps of unburnt powder in the barrel as the bullets hit the dirt a few yards from the muzzle.
Others barely made a supersonic MV when fired from 25" barrel.
Jack decided then and there, in 1959, that he must urgently fix this matter.
But it took him over 10 years to come up with the .450 Watts Magnum (origin 1949) shortened a bit to make it deserve to be called the .458 Lott.
In 1971 he set about converting .458 Winchester Magnum rifles to .458 Lott by merely re-chambering them.
Thus the Lottite cult emerged, and an evil commercial cabal arose to naysay and deny the .458 Winchester Magnum.
Everybody and his brother had to be convinced that the most effective safari rifle of all time, the .458 Winchester Magnum was no good.
Future users would no doubt end up as elephant and buffalo toe jam.

Reality: With so many .458 Winchester Magnums having been sold, the market was slowing down, and a stimulus was needed.
Yes, the .458 Lott was a sales gimmick.

In truth, in 1959, Jack Lott had gut shot that buffalo before it separated him from his rifle.
Wally Johnson emptied his .375 H&H into the buffalo before retrieving Jack's .458 Winchester Magnum,
with which he finished off the buffalo.

.458 Winchester Magnum Perfection
In maxima potentia parvum spatium.
Id venit et vicit omnis.

quote:

Originally posted by RIP:
One of the most laughable of Lottite confabulations you will read on the internet
and hear told on Youtube videos,
by armchair experts:

In 1959 in Mozambique, Jacques P. Lott shot a cape buffalo with his .458 Winchester Magnum M70 African rifle.
He was using Winchester factory ammo.
The shot only angered the buffalo, bouncing off the hide overlying the vital area of chest.
The buffalo was stung as if by a bee, and took it out on Jack, making him float like a butterfly into the bushes.
Jack was saved only by PH Wally Johnson coming to his rescue.
While recuperating, Jack dissected a factory round and found clumps of compressed and congealed ball powder inside,
and bullets that were loose in the cases and would twirl with light touch of his fingers,
except for some that had been snugged by Elmer's Glue at the factory.
He chronographed them and some rounds were squibbs that left clumps of unburnt powder in the barrel as the bullets hit the dirt a few yards from the muzzle.
Others barely made a supersonic MV when fired from 25" barrel.
Jack decided then and there, in 1959, that he must urgently fix this matter.
But it took him over 10 years to come up with the .450 Watts Magnum (origin 1949) shortened a bit to make it deserve to be called the .458 Lott.
In 1971 he set about converting .458 Winchester Magnum rifles to .458 Lott by merely re-chambering them.
Thus the Lottite cult emerged, and an evil commercial cabal arose to naysay and deny the .458 Winchester Magnum.
Everybody and his brother had to be convinced that the most effective safari rifle of all time, the .458 Winchester Magnum was no good.
Future users would no doubt end up as elephant and buffalo toe jam.

Reality: With so many .458 Winchester Magnums having been sold, the market was slowing down, and a stimulus was needed.
Yes, the .458 Lott was a sales gimmick.

In truth, in 1959, Jack Lott had gut shot that buffalo before it separated him from his rifle.
Wally Johnson emptied his .375 H&H into the buffalo before retrieving Jack's .458 Winchester Magnum,
with which he finished off the buffalo.

.458 Winchester Magnum Perfection
In maxima potentia parvum spatium.
Id venit et vicit omnis.

EXCELLENT!!!

Thanks RIP!

Bob
www.bigbores.ca

quote:

EXCELLENT!!!

Thanks RIP!

+1

Buy a donkey for the missionaries, Bob and crshelton.
That conflation of concoctions about the .458 Winchester Magnum denial movement
is merely a Lottite brain fart or bowel movement,
hard to tell which since those naysaying deniers do have dung for brains.

Jack had a good wildcat with the leade-only throat of a rechambered .458 Winchester Magnum,
but short-changed James Watts,
the Rodney Dangerfield of the .458.
Winchester did similar to James Watts, sad but true.
Art Alphin screwed it up further in bringing fame to the memory of Jack Lott with the short-throated A-Square 1996 forerunner of the 2002 SAAMI copy.
We salute most fondly the James Watts version of 1949.

A-Square's .470 Capstick and .500 A-Square were rustled up from John Buhmiller, Fred Barnes, and OKH.
Herding wildcats and re-branding for A-square is good work when you can pull it off.
The .577 Tyrannosaur was definitely the high water mark for Art Alphin, if only for the name of the cartridge, circa 1993.

Ross Seyfried wrote about his .585 Nyati rifles (2 of them) in the DEC 1991 G&A.
He joked then about it being a dinosaur stopper.
Art must have been listening, had to come up with a totally new brass case.
Has no one necked that one down to smaller caliber ?
.458 anyone ?
No, not when there is already a .458 Winchester Magnum.

I really cannot verify when James Watts came up with the .450 Watts Short.
Was it before or after Winchester did it in 1955 ?
Any information on that as well as any known throat specifications of the .450 Watts Magnum & Short still eludes THE MISSION.

After a nap, the urge to build a .458 WIN-PRC 2.5" or 2.1" went away.
A .458 WinM! with fast twist urge is still there.
Have not done a .458/.358 sabot load yet.
I would want to try the heavier .35 to .36 bullets,
not just .357 pistol bullets.
Maybe a high BC 9.3mm bullet could be saboted to success at fairly high MV in a 1:8" twist .458 WinM! ?

.458 Winchester Magnum Perfection
In maxima potentia parvum spatium.
Id venit et vicit omnis.

How about Jack Lott’s 460 Guns and Ammo.

quote:

Originally posted by LHeym500:
How about Jack Lott’s 460 Guns and Ammo.

I did not know that was a Jack Lott deal.

A 458 RUM.

The 460 (and 450 Dakota/Rigby) do a real easy 2500 f/s with 500 grains and 2350 are reduced loads. Much the same as the 416 Rigby and 400 grains. 416 Rigby is a bit smaller case because of more body taper.

The 458 RUM/460 G&A is good from the point of view of being OK in M70 and Rem 700.

quote:

Originally posted by Mike McGuire:

quote:

Originally posted by LHeym500:
How about Jack Lott’s 460 Guns and Ammo.

I did not know that was a Jack Lott deal.

Jack put the finishing touches on those after Tom Siatos and others started in on it.
Early 1970's for the .460 G&A Magnum,
followed by .450 G&A Short Magnum and .460 G&A No.2 (flanged, for a Bob Petersen double rifle and a Jack Lott Ruger No. 1).
The miraculous .458 Lott came along about same time the others were being developed.
Jack finally got his very own fix for the .458 Winchester Magnum crisis that had been so urgent to him since 1959.
IIRC, a 1989 G&A magazine article ("G&A's 'Proprietary' Big Bores") by Jack Lott recounted all this with no exact dates specified.
But he did say that A-Square was selling factory loaded ammo and brass for the .458 Lott "wildcat" in 1989.
Art Alphin was a topnotch rustler and herder of wildcats,
and a founding member of the Lottite Cabal, along with Jack Lott.

A 458 RUM.

The 460 (and 450 Dakota/Rigby) do a real easy 2500 f/s with 500 grains and 2350 are reduced loads.

2300 fps to 2350 fps with 500-grainers in 22" to 24" barrels was the stated goal of the .460 G&A, circa 6000 ft-lbs.
Jack claimed he could do 500-grainer @ 2375 fps with his .458 Lott wildcat with remnant .458 WinMag throat in a 25"barrel.
He does not say whether he exceeded 3.600" COL,
but he could well have in a BRNO ZKK 602,
one of his favorites for re-chambering, by hand.
Thus, the .458 Lott wildcat used more practical/cheaper/easier to form .375 H&H brass
to accomplish the goal of the G&A 404-Jeffery-based .458 project.

We all know that the .458 WIN+P+L will beat a SAAMI .458 Lott. It will do the same as the Jack Lott wildcat he made by rechambering a .458 Winchester Magnum.

Much the same as the 416 Rigby and 400 grains. 416 Rigby is a bit smaller case because of more body taper.

The 458 RUM/460 G&A is good from the point of view of being OK in M70 and Rem 700.

OK,
wait for it, the .458 WIN-Jeffery 2.5".
It will clean up the bottom 1.6" of a SAAMI .458 Win.Mag. chamber and leave 0.900" of neck and throat untouched.
The magical accuracy, pressure reduction, versatility of COL, and superb cast-bullet handling will be like a SAAMI .458 Winchester Magnum.
Small case capacity increase and headspacing on a shoulder instead of belt are the dubious advantages.
Magazine crowding and more expensive brass are the real disadvantages.
Dang !
Ken Howell was writing about .375, .416, and .458 Howell cartridges based on 2.5" 404 Jeffery neckings in the 1984 HANDLOADERS DIGEST.

I still can't think of anything better than a SAAMI .458 Winchester Magnum.

.458 Winchester Magnum Perfection
In maxima potentia parvum spatium.
Id venit et vicit omnis.

For some reason, the RCBS Cartridge Designer tool gives wrong case capacity for the .458 Winchester Magnum.
It is "missunderestimated" at 89.1 grains H2O instead of the more accurate 95.0 grains.

All the others are closer to reality.

Could this be evidence of the Lottite cabal of deniers having infiltrated RCBS for the purpose of selling more .458 Lott rifles ?

Maybe. But, even the .458 Lott is a little off here.
If the .458 WM gets 95.0 grains H2O, then the .458 Lott should get right at 107.5 grains of H20, not 106.2 grains.
A .458-caliber cylinder of water one inch long weighs 41.66 grains.