New Military Ammunition

I can see how this would work in an M2 Browning and other machine guns where the round pretty much feeds straight into the chamber, but wonder about the durability in either 7.62x51 or 5.56.45 in rifles where the feed angle might well bend the case without much problem. A misfeed with brass cases in an AR can put a good ding in the case body. Maybe I'm just the eternal pessimist.
 
Plastic cases, with or without a metal head, with single or multiple bullets, have been around for quite a few years. I have several different versions in my collection. It's hard to find anything that the military has not tried once, or even several times, since WW II. What is most interesting is that they always seem to come back to the old standby of a brass case, with a percussion primer, firing a single bullet.
 
It's quite a benefit from the standpoint of weight. I think the story says the weight reduction is 40%.

Now about polymer 6PPC cases........
 
ehparis

Here's what you're looking for. This one has a polymer case and steel head. It's loaded with a .17 caliber bullet in a sabot. Just neck it up to 6mm and you're good to go.

As you might guess, a military experimental for a machine pistol that never made it.

Photo angle makes it look crooked. It's straight.

16k0qk9.jpg
 
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The one they called a SLAP round, Im not even sure what that stood for, was a 50 cal shooting a sabot and a 7.62 bullet. Guys I knew that worked out at Lake City used to talk about how flat it shot. It was made after I worked there.
 
Back about 20 or so years ago My brother had afew rounds of 308 military with a brass head and the synthetic case.
He didn't comment on where he got it only said it was military. I believe this has been in deveelopment for a long time I hope it does work out with zero problems. Our boys come First''
 
SLAP = Saboted Light Armor Penetrator. They were tried in virtually all military calibers. A tungsten penetrator in a plastic sabot.
 
I haven't heard about 50 BMG SLAP rounds for 20 years, but back then they sounded pretty good.

IIRC muzzle velocities close to 5000 fps were possible.

Has anyone heard about them being used more recently?

In particular in sniper rifles?

Ben
 
My understanding from previous trials of this type of ammunition, was a tendency for the polymer composites to soften in hot chambers. Compounded further in those weapons that fire from a closed bolt. This variation appears to have a little more metal in the base to enhance extraction and contain pressures in these situations.
 
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