I guess i've been lucky w/ the x bullets, I've never had a copper fouling problem. I have been moly coating my own for a few years though. I also get good accuracy w/ em, although listening to these guys maybe I could get some excellent results w/ the triple shocks. I dont see where the triple shocks would fail to expand, they are supposed to be the same except w/ expansion joints(welding term) cut in them. they should perform the same on the animal? I do uderstand why they would foul less, but lack of expansion?