I hear some Mini 14s don't like it, but aside from that nope. I shoot just about exclusively Brown Bear, in fact. Its dirtier than brass ammo, make sure to give the gun a good cleaning. Smokes a tiny bit, not bad though, and smells different. Technically, it also wears out your extractor faster, but unless you wake up with a mag dump each morning, you'll never notice it.
During a high rate of fire, the coating on the steel case can melt and cause stovepipe issues. Also, as that coat begins to melt, it sticks the case in the chamber and can cause extra wear on the extractor.
Ctd is a ripoff. Glens outdoors has some of the best prices but they sell out quick. Ammoman.com isnt bad. sometimes Aim surplus has a deal but its rare. Dont use steel cased ammo if you want reliable ammo that isnt going to wear your extractor.
The coating is Laquer so just imagine dumping it into a hot weapon that isnt a Ak.
Never had any problems. I've shot 200 rounds of it at a time in 30 round mags, some were straight mag dumps, others were plinking. Gun was hot as sin, even the handguards were getting unbearably hot. No problems.
