If it is LC Match, it will say LC Match with a date on the headstamp (at least it used to). All marked "Match" have no crimps and are the same as commercial brass. I have a bunch of LC Match 71 I bought many years ago when you could buy surplus ammo (I even have a 1 lb. can of DuPont IMR 4850 with a price of $1.95 on it and I still refer to a bottle of whiskey as a fifth so I must be an old fart). I don't know about the thickness of the brass as I don't load them that hot and do not see the pressure problems one can have with regular military brass and getting close to maximum loads. I use the RCBS Primer Swage die on my GI brass and it works great.