258gr Flat Base Raptor for .458 SOCOM in .458B&M

06 August 2013, 05:51

7MMNut

So I started working a couple of weeks ago with these bullets in my .458B&M. Michael has already provided plenty of terminal performance information and I think there's more to come from other hunters. I thought I'd share my range experience.

With 77gr of H4198 my loads were showing roughly 2880-2890 fps through the chrono on my first trip to the range. I loaded up some more this past week and had a bit of work to do with the scope.

This week they were clocked at about 2855-2861fps. Not sure why the difference, perhaps light, humidity, a barrel needing cleaning? Not sure, and am not too concerned.

Once I had the scope settled at close to 2.25" high at 100 yards, I shot a 3 shot one hole group. The shots were overlapping making about a 1" wide hole from left to right virtually all 3 shots at the same height.

I then put a Shoot-n-C on the target and moved it out to 200 yards. The picture is of a 4 shot group. I'd say this load would do well for most PG shots.

The 3 shots to the left were directly above the bullseye. The average height above the bullseye was approximately 1.8".

06 August 2013, 15:43

michael458

Phil

Again, incredible..... 200 yard group, 4 shots, 1.2215 inches center to center......

Yes, with this 250 you are covered on everything on the planet less than the mighty buffalo, including big bears and lion + all plains game, elk, moose and anything else. Go to the 450 #13 Solid and matching 420 #13 HP and then buffalo, hippo, and elephant are covered as well.

458 B&M... these three bullets, and you rule the world from that point on.........

As for the loads, you have them covered............

Just Excellent.........

Michael

07 August 2013, 08:00

capoward

Great shooting Phil. It appears that you went to the same shooting class that Ron Berry attended...

07 August 2013, 08:07

505ED

I think I need a few of those for my 458 win...

Ed

07 August 2013, 08:17

Biebs

Ed, they won't work....your gun is left-handed :-)

07 August 2013, 08:24

505ED

quote:
Originally posted by Biebs:
Ed, they won't work....your gun is left-handed :-)

Oh shoot your right Jon...those bullets are for right handed guns...they would shoot backwards.....That would have killed me....you saved my life!

07 August 2013, 08:49

7MMNut

quote:
Originally posted by capoward:
Great shooting Phil. It appears that you went to the same shooting class that Ron Berry attended...

Can't say I know who Ron Berry is. The gent who hired me to my present job gets a lot of credit for showing me some important fundamentals to shooting accurately.

The credit for shooting big bores accurately goes to AR members posts and a lot of reading on my part.

These bullets are quite a hoot to shoot when you want to throw a bunch down range....albeit a bit pricy.

08 August 2013, 10:14

capoward

quote:
Originally posted by 7MMNut:
quote:
Originally posted by capoward:
Great shooting Phil. It appears that you went to the same shooting class that Ron Berry attended...

Can't say I know who Ron Berry is. The gent who hired me to my present job gets a lot of credit for showing me some important fundamentals to shooting accurately.

The credit for shooting big bores accurately goes to AR members posts and a lot of reading on my part.

These bullets are quite a hoot to shoot when you want to throw a bunch down range....albeit a bit pricy.

Sorry for the long response...

Ron Berry uses the pseudonym of ‘RIP’ on the AR Forums…

And this is why you both received extremely good instruction from a BB marksman…

Excerpts taken from Cutting Edge Bullets: 49-Bore/.500-Caliber/.338LM Improved of 2010 ... 12.7x68Magnum – Page 7:
http://forums.accuratereloadin...043/m/5931027531/p/7

Here is the cartridge and bullet:

quote:

quote:
Oh no! I could never do that!
(Involuntarily crossing legs and placing hands over crotch.)
My Winchester M70 in 49-10 must keep with the 24" barrel length ...
It loves those 430-grain CEB MTH bullets so well as it is.
I would not dare mess with it!

Shot off the hood of a car in a cow pasture:

Two excellent "longrifles" chambered for 12.7 X 68mm Magnum/49-10 by Rusty McGee, Kentucky Longrifles, of the common .50 cal, modernized:

quote:
As a reminder, here’s the relating information and targets:
Rifle No. 1:
Make/Weight/LOP: Winchester M70, 9#-3 oz. dry weight, 14.5”
Barrel: PAC-NOR No. 6 sporter contour, 1:12” twist, 8-lands/grooves, 0.785" diameter at 24" muzzle
Scope/Sight Height: 2.5-8X Leupold @ 11.4 oz, 1.50" (1.96”??? not sure as it wasn’t stated)
Rings/Bases: Leupold QRW steel rings & steel bases @ 16.0 oz.
Altitude/Weather: 300ft. alt., 75F, 29.53"Hg, 78% RH
Bullet: 430gr .500 CEB MTH copper HP spitzer
Bullet Length: 1.349"
COAL/Loading/Velocity: 3.583”, 100.0 grains of H322 powder, 2662.0 fps @ 15ft from muzzle, QL computed 58737 psi
Sighted POI/ Target Impact: +3.0” @ 100yds and -4.9” @ 300yds (center of grouping)
Group Size: 1.569” (center of grouping)

and
Rifle No. 2:
Make/Weight/LOP: BRNO ZKK 602, 9#-6 oz. dry weight, 13.5” (requires a LimbSaver slip-on pad to get 14.5" LOP)
Barrel: PAC-NOR No. 6 sporter contour, 1:12” twist, 8-lands/grooves, 0.785" diameter at 24" muzzle
Scope/Sight Height: 2.5-8X Leupold @ 11.4 oz, 1.50"
Rings/Bases: Standard CZ rings + homemade QD levers @ 6.7 oz.
Altitude/Weather: 300ft. alt., 80F @ 3PM, 29.53"Hg, 55% RH (I check the weather for this one)
Bullet: 360gr .500 Talon Tipped CEB ESP Raptor brass bullet (350gr W350 bullet + 10gr W Talon tip)
Bullet Length: 1.482" (with tip installed)
COAL/Loading/Velocity: 3.602”, 95.0 grains H4198, 2903.0 fps at 15ft from the muzzle, QL computed 63042 psi
Sighted POI/ Target Impact: +0.5” @ 100yd and -9.25” @ 300yd (center of grouping)
Group Size: 1.069” (center of grouping)

[IMG]

08 August 2013, 21:32

capoward

And I should say, "sorry for the hijack."

09 August 2013, 05:44

RIP

Jim,
The .500/360-grain brass Raptor in Rifle No.2 did a little better than the .500/430-grain copper MTH in Rifle No.1, but not statistically significant ... more shooting is needed.

Phil,
Good work. It is nice when bullets go into the same hole at 100, 200, 300 yards.

BTW, you weren't trained by Master Mitch Carter, were you?

Master Mitch shot this 100-yard, 3-shot target with his 577 Tyrannosaur in 2001: 650-grain Woodleighs
Indoor range on Long Island.
"Hell, I Was There!" and Elmer wasn't.

09 August 2013, 06:22

7MMNut

quote:
Originally posted by capoward:
And I should say, "sorry for the hijack."

Thanks for letting me know who Ron is, I've read many of RIP's posts but didn't know his real name.

No need to say sorry, no hijack. I'm an electrical engineer by day and a would be "ballistics engineer" by night so I find that thread very interesting. I had missed that thread, and spent sometime this evening reading it.

Between RIP's results and what I'm seeing so far, the listed BC for CEB bullets is not making sense. It seems to be much better than advertised. This is only giving me more desire to do more precise characterization of these 258's at 100, 200 and 300 yards.

09 August 2013, 06:25

7MMNut

quote:
Originally posted by RIP:
Jim,
The .500/360-grain brass Raptor in Rifle No.2 did a little better than the .500/430-grain copper MTH in Rifle No.1, but not statistically significant ... more shooting is needed.

Phil,
Good work. It is nice when bullets go into the same hole at 100, 200, 300 yards.

BTW, you weren't trained by Master Mitch Carter, were you?

Master Mitch shot this 100-yard, 3-shot target with his 577 Tyrannosaur in 2001: 650-grain Woodleighs
Indoor range on Long Island.
"Hell, I Was There!" and Elmer wasn't.

Thanks RIP / Ron! Curiousity is only increasing now, and I'm going to have to do a bit more.