XM193 brass not NATO Spec

[Zerorye351w]

I have some LC 2010 manufacture XM193 brass that is not NATO spec. I am wondering if this is normal? I went to use my RCBS primer pocket swager die, but the case mouths were too small to fit the die after resizing with small base die. I looked at the primer pocket and said, heck with it, one primer won't hurt to have hands on knowledge. So I used my RCBS hand priming tool and inserted a CCI #400 Small Rifle Primer into the pocket. Went in smooth, depth is good and it doesn't fall out. I loaded up some with Varget powder and 55gr Vmax bullets. Were alot softer shooting than the XM193 55gr ball.

I guess I rambled into my story a bit, but my question is does anyone have similar results with priming without swaging using the 5.56 55gr ball XM193 brass? I suppose a quick look at the brass and not seeing the NATO cross would've given it away, but it's XM193 and I was under the impression that it's NATO spec 5.56 ammunition.

[FLIGHT762]

There's lots of non NATO spec 223/5.56 ammunition that has the primers crimped in. Most all of the Federal, Speer, Hornady and Winchester Law Enforcement ammo has crimped primer pockets and the ammo is not NATO spec./ marked.

Your brass may not have been given deep primer pocket crimps. I've had different year lots of Lake City 5.56 Military, NATO brass that had very light primer pocket crimps and I was able to get a new primer in without decrimping. Sometimes Winchester 5.56 brass has very light primer pocket crimps.

Take a look at the primer pocket with a magnifying glass and see if there actually was a crimp put into the pocket, it will be easy to see. I would only guess your brass was crimped being it is XM193, but maybe not.

[Davisje011]

LC brass can be crimped or non-crimped, the only difference is when or where they decide to route it for civilian use. further down the assembly line they crimp, but the rounds are finished before.

I do lots of LC and other 5.56 brass, some have crimps, others don't. but in the end, they all shoot fine.