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Tue, Nov. 9th, 2010, 09:46 pm
Getting through obstacles

Suppressed .458 carbine.

Effect on target behind 1/4" diamond plate and 7" seasoned wood.

SBR Ammunition

.308AP would penetrate similarly, but it won't fit in .223 sized receiver like .458 does.

Wed, Nov. 10th, 2010 04:00 am (UTC)

Is that aluminum diamond plate?

Wed, Nov. 10th, 2010 04:06 am (UTC)

It is aluminum. Same material as used for truck tool boxes. We fired the .458 at 1/4" armor plate also without achieving penetration, only a serious dent. For reference, 1/4" armor plate is what a 1930s light tank like a BT-5 would have. 338 Lapua punched through that, but that required a much larger weapon.

Wed, Nov. 10th, 2010 04:18 am (UTC)

When you say "armor plate" do you mean actual RHA class stuff, or just plain steel?

I presume the former, because even a plain old 7.62x54R will go through 1/4" plain carbon steel.

Did you shoot the 1/4" aluminum with anything else? I wouldn't expect it to stop much of anything, really. 9mm, maybe.

Wed, Nov. 10th, 2010 04:21 am (UTC)

9mm and 45ACP went through, 32ACP bounced off. The real test was the 7" thick log behind the plate. .223, for example, completely fragmented after hitting the plate. .308 ball didn't fragment but it failed to penetrate the wood all the way.

Wed, Nov. 10th, 2010 04:22 am (UTC)

By "armor plate" I mean hardened stuff that stops .223 and 7.62x39 with just minor cratering. We used the old swinging steel target that had its chain shot off.

Wed, Nov. 10th, 2010 11:57 am (UTC)

Don't suppose you tried .30 M1 ball? Wouldn't expect it to be too much different to the .308, but I do recall it was reputed to penetrate eight inches of oak.

Wed, Nov. 10th, 2010 10:35 pm (UTC)

I tried both .30-06 and .308 armor piercing on a railroad lock down plate. It left smudges. ;) At some point I'll drag it out and see what a solid brass .50BMG bullet will do to it.

Wed, Nov. 10th, 2010 04:59 am (UTC)

Impressive. I'm assuming "bross" was supposed to be "brass", though.

Wed, Nov. 10th, 2010 05:10 am (UTC)

Thanks! Fixed.

Wed, Nov. 10th, 2010 08:49 pm (UTC)

Looks interesting. And fun. At mid the 40s up to 65 dollars per 20 rounds, you'd best figure on reloading your own though. -- Lyle

Wed, Nov. 10th, 2010 08:54 pm (UTC)

True. You can get hard-cast loads for $33/20. http://carsonspecdev.com/csd_ammo.html

Thu, Nov. 11th, 2010 02:05 am (UTC)

Hmm. I'd have to see the gun camera film on that one. The first time I had to deal with a clogged gas system, it was a an M1 .30 Carbine that had been used with cast lead bullets. Lead shavings built up in the gas chamber, jamming the piston solid, and it took a lot of effort to get it apart for cleaning. The second and last time I dealt with a clogged system it was another .30 Carbine and the lead from thousands of exposed lead bases of FMJ rounds. In that case it was hard, lead dross, rather than tiny shavings. From those two experiences, I'd recommend TMJs, softpoints, hollowpoints, or solids (none of which have any lead exposed at the base). I use hollowpoints almost exclusively in my .223 and .308 semis.

The AR's a bit different, granted, but I'd be watching that gas system closely for build-up from lead bullets. If it can handle lots of them without trouble, one could cast one's own bullets. That would be quite cool. -- Lyle

Thu, Nov. 11th, 2010 02:07 am (UTC)

I asked the maker of these cartridges, he said "no problems encountered". These bullets are cast pretty hard, I would expect more issues with the remnants of lubricant. Not everyone uses .458 SOCOM in ARs, either...plenty of suppressed bolt rifles in that chambering.