Re: Russian Steel Cased Ammo
I've shot a few thousand rounds of it through various ARs, watched my buddies shoot a similar amount. It is noticeably lower velocity and sometimes it won't cycle in guns that have issues, or at least won't lock back the bolt on an empty mag.
That said, I've always seen it to run well in guns that are in good working order. Accuracy wise, it's good for about 1MOA in pretty much every gun I've ever shot it in. Caveat is I've never shot it over 300 yards. Definitely a bit dirtier, but if you're shooting a lot, you're cleaning a lot no matter what you shoot.
Further caveat--if you are doing lots of tactical drills, you are going to have problems with this stuff. After running a few mags through the gun quickly, the gun reaches some temperature where it melts the laquer or polymer coating on the case and the case sticks in the chamber. The first time this happens, you might be able to mortar the round out. The second time it happens, you are going to tear the rim of the case off. Then have to beat the case out from the barrel end using a cleaning rod. And then scrub your chamber down well.
This is based on a sample size of about a dozen ARs/M4geries. All in all, buy it, shoot it, use it, but for competitions or serious training, it's not really suitable--cases will definitely stick when the gun gets hot enough.