Born on 20-June-2008.
She may need corrective surgery for the giant nevus on the end of the barrel, and for the hypoplastic bolt handle, and hypertrophied trigger and safety. Maybe the AHR Rehabilitation Center in Montana (AHR-RC-MT) will get her straightened out. They have special capabilities in CZ rehab.

This is a rebarrel of a CZ 550 Safari Magnum "American" .416 Rigby.
As shown in the naked baby picture, birth weight was 10 pounds 8 ounces:


Barrel is 25" stainless Harry Mcgowen 1:10" Twist.
It has an integral secondary recoil lug and rear sight island:


Contour is about same as used on the CZ .505 Gibbs. Muzzle diameter is 0.825" right where it joins the Vais Brake, screws on with knurled thread protector when removed:




The finish on the barrel is a sanded bare stainless "Snake Skin." It could easily be covered with matte black Gunkote like the 3.4" length of giant nevus on the end of the barrel at birth.

Kevin was packing up his machinery to head off to medical school, so we took the expediency of just stamping the barrel instead of waiting on an engraver. Engraving the other side of the barrel is planned. The integral rear sight island is big enough billboard for a buffalo skull and Hammer of Thor depiction:


She is completely bedded and pillared from tang to full contact at forend tip with gray epoxy around the barrel, that shows a bit in the photo above, brown epoxy at the action tang, properly relieved. If it doesn't shoot, I will relieve the barrel channel forward of the secondary recoil lug. Hopefully it will not be necessary.

Yes it feeds dummies well but might need some more polishing of the ramp and rails. Kevin knew I could do that myself. I am lucky he found time to get this much done, as busy as he has been lately. I am grateful. Thanks to Kevin Jenkins.

Reamer from Dave Manson.
Brass from Quality Cartridge, in the works.
Reloading dies not available yet.
I will be using 470 Mbogo brass and dies and a combination of .505 Gibbs and 500 Jeffery dies to neck and seat and crimp the ammo for now.

As soon as Redding finishes the .398 Lapua Mag. dies (my fourth .395 wildcat yet the first ever conceived), I'll see if they can make 500 Mbogo dies, from the Dave Manson reamer drawing and/or from fireformed brass.

Well, There you ya!!
About Durn time they got you finished up!!! Gunkote you say? I might could warm up to gunkote...

good on ya, Ron... good and safe shooting.

jeffe

jeffeoso,
Thank you very much!
The delays were many, for many reasons, but worth waiting for, and Kevin is a dear friend and excellent smith. The last 3 months were spent waiting for the Vais brake.
After the third order by personal phone call, they said "oops" and made it up and shipped it to Kevin in one week ... after 3 months of losing the order repeatedly.

Kevin could have made one himself much quicker, but we were already set on that: It was supposed to have saved him some time to put the pre-fab brake on instead of piddling with making one, with so many other things on his plate at the time.

The Snake Skin is growing on me.
As for future engraving, how about a smaller version of this logo like on my 470 Mbogo?


Maybe a smaller version on either side of the rear sight island, but inlayed in gold and platinum rather than epoxy and aluminum chips?

CONGRATS!

Congratulations indeed!

Dankie, boom stick.
Dankie, Charles_Helm.
Baie dankie!

500 Mbogo Dummies:
3 different brass makes:
L-R:
Norma .416 Rigby basic necked down (blank headstamp)
Quality Cartridge "470 Mbogo" (headstamped) necked up (looks like Norma basic was used)
Jamison "Mbogo 470" (headstamped) basic necked down


Soon there will be a fourth:
Quality Cartridge will be using Hornady basic to make "500 Mbogo" headstamped cases.

You can load 570-grainers down to 2150 fps with a case full of H4831SC: less than 40Kpsi

You can load 570-grainers up to 2500 fps using RL-15 or Varget: More is possible but why bother?

You can load 750-grainers up to over 2150 fps (1000-yard supersonic) with H4350: If the 50 Peacekeeper could ever do 2300 fps as claimed, then the 500 Mbogo can do more.

It always makes me smile to see a new baby being born.

The 500 Mbogo is a hell of a versitile cart.

It is also the big brother to the 500 AR

No niche will be unfilled here on AR

Headstamped brass is so cool rip

@ 2150 the brass should last a looooong time

Question... what is the capacity of the Mbogo vs the Jeffe?

Now for all the debate over 500 Jeffery vs 500 A2 vs 500 MBOGO.

I'll start...No rebate and feeding issues

Rip... What is the budget conversion costs from a 416 Rigby? $600? Chamber, barrel swap and minor rail work?

Would this be a good cartridge for the Montana PH action, or is the action better suited to a longer, more powerful cartridge like a 600OK?

In a word yes. And the 600 OK as well.

Correct me if I am wrong but the PH action is designed for carts like the rigby based size up to shortened rebated rimmed 50 bmg cases like the 700 DA/700HE

I would like to see a 3" bmg case necked to .729" (rifled 12 gauge barrel size) that could fire regular 2.5" 12 ga shells.

kinda like a shorter version of the 729 Jongman

boomstick,
Let the comparisons begin, AGAIN!!!

L-R:
500A2
500 Mbogo
500 Jeffery
.505 Gibbs: A-Square 525-grain RN solid

If the 500A2 is about 150 grains water gross,
500 Mbogo is over 150 grains,
500Jeffery is about 160 grains,
.505 Gibbs is about 180 grains.

I'll fireform some and measure the 500 Mbogo with whatever brass I can get loaded by tomorrow. It will be a first.

Woodrow S,
This is a perfect cartridge for the true Mauser M98 Magnum, CZ 550 Magnum, Ruger RSM, etc.

Any true magnum action with a .700" bolt diameter and a 3.8" magazine box will do fine.

The rationale for this is avoiding the bulkiness of bigger actions and cartridges. No need for anything bigger. Recoil is all I care to deal with from my experiences with 500A2, .505 Gibbs, and 577 T. rex.

Fine from the bench or a sit with the brake. Fine for stand-up shooting off hand or off sticks.

Notice how the .505 Gibbs shoulder is very close to the same distance from base and same angle as the 500 Mbogo. It can be used as neck sizer after the 470 Mbogo die sizes the body and shoulder.

Then the 500 Jeffery sizer will size the neck from .505 to .510, and the seat and crimp die (backed out a bit from full down position) can be used as a seater and crimper for the 500 Mbogo ... until custom dies are had.

Loading data is the same as for the 500A2, and then some.

Cool... If the 500 Mbogo is 5 grains off the Jeffe it is not any diff to get uptight about. Nobody complains that the 500 A2 is lacking

I need to send you a 500 KILL ALL to add the the 500 club class picture.

The modular snout on this rifle is the Cat's meow!!

What other little devices can we attach for shooting entertainment??

The integral site mountain is slick too!! What method did Kevin use to profile the barrel??

That Stainless Snake Skin with black barrel tip is a head scratcher, for the extended pinky finger crowd, but I like it!

Kevin worked his magic on a round donut that Harry McGowen left on the barrel, same place as he did the CZ barrel donuts when he was making barrels for CZ, Safari Classics. Harry did the profiling. Kevin shaped the donut for recoil lug and sight base, dovetailed in an NECG rear sight, cut it from 28" to 25" threaded and chambered, installed the front sight, and installed the muzzle brake. Kevin polished the cocking cam and inside the box and feed ramp, and tuned the trigger to a 3.25# single stage, non-set trigger. Crisp and no creep.

Ron- Glad you finally got it working and good to see another minimum shoulder-thought to be impossible cartridge work just fine. But that barrel finish and the rear sight island? Yeesh! That has to go! Did he really do that on purpose? Looks like a broken tool was used to contour the barrel and the barrel was vibrating in the Lathe at the same time. I usually stop and correct those issues before continuing. Why didn't he at least turn the brake down to fit the shoulder of the barrel? The nipple approach really should have been a cone. That thing needs major corrective plastic surgery to make it homely! Irregardless of the cosmetics glad to see you got it done.-Rob

quote:

Irregardless

quote:

Originally posted by Macifej:

quote:

Irregardless

Macifej the english teacher?

Rob cant be a genius in all aspects...

On topic...

What has the potential for more guns made the 500 or the 470 Mbogo?

Speaking of the 470, where is Dave?

Danmn...gotta spell check my posts now.

He's around - heard from him a couple days ago.

Sorry guys but that finish, rear sight island and especially the muzzzel brake are just plain hideous in my view. I doubt RIP really likes it either. BTW just gun coating it won't be enough to get rid of that kind of finish.It will show thru.I've always liked the .500Mbogo though and years ago opined that it had enough shoulder to work when Jeffe and Dave Estergaard first came up with it. Glad to see it got done.

irredgardless is more of a word than email, gentlemen... if you would actually like to engage your brain .. does unravel mean the opposite of ravel?



Rob,
It was all Dave on that... he dropped a dummy into my hand that afternoon in 2003, right? then gave it to you, too.

Its going to be a great round, just like the a2,wells,KX .. all of them are just about the same same same case capacity..

jeffe

quote:

irredgardless is more of a word than email

Uh?......No!!

Just like your typing and spelling Jeff??

It's anything you want it to be Bubba...as long as it makes you happy.

Back to 500's:

Thanks Rob! Real attention getter ain't she?
That "Snake Skin" finish is done with some abrasive and a lathe. I asked for it like this. Complete with giant harry nevus of Gunkote over the portion of barrel bearing the front sight.

It is really growing on me. But if it offends too many extended pinky fingers ... screw them!
The texture of "Snake Skin" is smooth to the touch. A bead blast would erase it completely.

The barrel extends about an inch beyond the front sight. Yep, Snake Skin barrel sticking out beyond the giant hairy nevus. The brake screws on to about 1/2" of that inch, and the stainless Vais Brake is Snake Skinned too.

Hey, my .398 Lapua Mag. has a Snake Skin barrel too, but without the giant hairy nevus. Only the front sight band and ramp was blacked with Gunkote.

This is my second Snake Skin, I like it so much.

About .510-calibers on the .416 Rigby:
I poo-pooed it back in 2001 when we heard of Scandinavians who were doing .510/.338 Lapua Mags. John Buhmiller was doing it back in the 1950's.

Rob,
Thanks for the note on the minimum shoulder design. At 20-thou per side, it is bigger than several other glory hound cartridges out there, and more than 50% bigger than the step on the 10.75x68mm Mauser cartridge.

Now y'all go to the waterboarding thread and see how the .395/340-grain GSC copper FN compares to the .395/330-grain S&H brass FN.

Here is what that barrel looked like as it came from Harry McGowen, shiny-smooth stainless, 28" long, 1:10" TWIST, .510"-50-caliber, six grooves:

Looks good to me....

I'm doing a barrel now with the same "apparatus"...

quote:

Originally posted by Macifej:
Looks good to me....

I'm doing a barrel now with the same "apparatus"...

Jay,

Oh really? Do tell more. I love that barrel finish. I also love the "rear sight mountain." Reminds me of Ayer's Rock. And downunder it is an integral recoil lug, made from the same donut.

Rob is just green with envy.

Snake Skin: Looks kind of like a cross between jewelling and damascus steel wall hanger, eh? It is absolutely smooth to the touch, fine as frog hair, smooth as a baby's bottom.

I don't know exactly how it is done but will call Kevin and ask him when he gets a break from dissecting his cadaver.

Sumbuddy who know?

Integral longitudinal mounting block on the underside of the cylinder section....no threads on any of my stuff as usual....

I just wanted to see that Dave and Jeff is got their just rewards and sorry to hear you actually like that snake skin whatever. Sorry but that is a machining mistake if ever there was one and no amount of BS will cover it up. Sorry but show me another custom gunsmith that turns out anything that hideous and gets preople to pay for it? There really is no acounting for taste is there? Enough said. Stored away in memory. I've said enough! I do like the cartridge nd congrats on making it happen. My critique is not personal just a comment on the gunsmithing as I know you didn't do it yourself. Not flaming you or anyone else. Bye-Rob

Well hot dang. I am the first to do a 500 Mbogo,
even though it has been incubating for over two years, so don't say I didn't give everybody a chance to beat me to it.

4 other wildcats of .395 caliber worked their way urgently in there, all but one of them now completed, and it is coming along whenever my other smith, Rusty, can finish off my .395 Ruger Max.

I give full credit to Dave Estergaard for creating the 470 Mbogo, and honor him, giving full credit by the name of the cartridge "Mbogo."

No way else to go bigger on the .416 Rigby case but to lengthen it, a little longer than Dave's 2.945" case max for the 470 Mbogo.

Here the 500 Mbogo is unique: The case max is 3.000" ... working on growing the brass to that length now.

This is all hobby fun, let's not be too serious.

Some of us flaunt our lack of extended pinky finger, even though we might have a "doctoral" degree and the subject smith is Colorado School of Trades trained and has 2 masters degrees (MBA and Healthcare Administration) was a Pre-dental student before he went to gunsmith school, is a US Army Veteran, has been one of only two gunsmiths in the USA (at the time) working for a certain federal government agency that uses sniper-counter-sniper rifles, father of three beautiful little girls, and is going for his M.D. now. White Coat Ceremony coming up, right after he proves he can dissect a cadaver and not vomit. All that by age 39. He is smart and he is highly skilled. Jack Benny eat your heart out.

Same-old-same-old extended pinky finger stuff: Not my cup of tea!!!

If you like Snake Skin ... you might be a redneck.
What can I say?
I'm a cheap redneck.

Never can please ol Rob!!!

RIP .., I LOVE it ......
?? Sling attachment ?

What is a [NEVUS ]

COOL COOL COOL !!!

gumboot458,
Thank ye kindly!
Another man who refuses to extend his pinky finger when drinking tea!

The front sling stud will go on the forend tip. No barrel band sling for this varmint rifle. As light as the barrel is a tight sling will change POA markedly at longer ranges.

A "nevus" is a mole. A "giant hairy nevus" is a big black birthmark. Sort of like that blackened 3.4" of distal barrel that includes the front sight on this new baby. Consider this one a beauty mark, like that on Marilyn Monroe's face, only a whopper.

Thanks for noticing.

Oh- I'm easy to please and just don't agree thats high quality stuff despite the credentials. As you know,just because you have the credentials doesn't mean you can walk the walk! Also just wanted to make sure everyone knew to give Dave and Jeffe their due in designing that cartridge in the first place. Its true, that Only RIP was interested enough to actually make one so good job there. When it comes to asthetics I'm constantly surprised at what people will accept these days. Beauty is in the eye of the beholder. Not worth any further discussion. Anyway have fun with it. -Rob

It could have naked lady mudflaps and would still be cool... its all about the largest non belted rigby based cart that will soon have headstamped brass. GO RIP! Add some more flair... Nothing could be a gaudy as a pimped out Weatherby.

quote:

Originally posted by boom stick:
It could have naked lady mudflaps and would still be cool...

Great idea, boomstick!

I need a slip on pad to bring that stock to 14.5" LOP for my comfort. I will see that the Mudflap Lady is painted on the butt pad ... or I will inlay her in black epoxy on the buttstock myself, similar to the way I did the map of Africa on my 404 Jeffery butt, and the buffalo skull and hammer of Thor on the 470 Mbogo forearm.
Then I will get a McMillan stock to replace it.

As for all this sniveling about who designed the 500 Mbogo: They discussed necking up the 500 Mbogo. Dave Estergaard made dummies first, from his 470 Mbogo.
Jeffe has designed a shortened Rigby version.

I am the one who drew it out on graph paper by hand and discovered the wonderful fact that making it 3.000" long corrects the short neck that even the 470 Mbogo suffers from. The 500 Mbogo has a caliber-length neck, very close to .510" long. I did the neck and shoulder calculations and chose them as they are, taking off from the 470 Mbogo shoulder diameter and angle (headspace gage unchanged) and built out from there. I did not copy anybody's design here, save basing it on the 470 Mbogo necked up, Dave's old abandoned idea.

I give my permission for anyone who wants to order my reamer to get one from Dave Manson. I believe my name is on that design.

It is hereby released to the guntrade.

Maybe use these chrome ones with "mounting hardware" inlay them to be flush. The chrome will be a good all weather compliment to the stainless. Makes an emergency signal mirror in a pinch



http://cgi.ebay.com/ebaymotors/Set-Smll-Mudflap-Girl-Cu...dZ1QQsspagenameZWDVW

Perfect!
How did this shape come to be associated with mud flaps?
Is it because her tail is dragging?

quote:

Originally posted by boom stick:

quote:

Originally posted by boom stick:
In a word yes. And the 600 OK as well.

Correct me if I am wrong but the PH action is designed for carts like the rigby based size up to shortened rebated rimmed 50 bmg cases like the 700 DA/700HE

I would like to see a 3" bmg case necked to .729" (rifled 12 gauge barrel size) that could fire regular 2.5" 12 ga shells.

kinda like a shorter version of the 729 Jongman

I've been wondering, what would happen if boom had el jeffe's shop and RIP's bank account?

I would be dangeous!

500 Mbogo:
Original concept by Dave Estergaard.
Independent design specification, improvement, and execution, despite persecution, to first functional rifle by Ron Berry.

Fifty-Aught-Eight, of 2008. Finally, someone did it, dad gum it!!!