Love shooting junk outta my BO. I even bought a swage to resize the odd .312 ones to .308 just to have extra plinking ammo. If I don't get rid of all my 7.62x39, Ill pull them and resize too.147gr FMJ are made by all the big bullet companies for the military as it's the projo for M80 ball. Put a magnet on it. 9 outta 10 it'll stick.
They are great for 300 BLK at 1800-2000fps.
Some shoot great and some shoot like garbage. Depends on the manufacture.