I usually shoot PMC Bronze .223 in my AR's. Some of it is FMJ and some is FMJ-BT. I'm just a casual shooter, not really that good, I don't compete, and I'm almost always within 75 yards. Honestly, I cannot tell a difference in accuracy or any other characteristic between these two projectiles. Can any of you actually see a difference in these two, and if so, under what circumstances?