I'm coming across this more and more, where ranges don't let you shoot steel cases. They inspect your gear and hold your ammo if it is steel. What's the deal, they only want to take your brass to recycle and re-pack? I just finished my 7.62x39 Ar and all I bought so far was steel cased. My first attempt at taking after I built it too! Denied! And they don't even sell brass 7.62 there.