Sabot loader you forgot one other thing. I walk into Wally worldthere is a wholerack of PB's. I go to Dunams and there is again a whole rack of them, gander mountian too. They are all over the place in amazing numbers for 50's any way. Shock waves are a bit harder to find on store shelves and I have yet to see a barnes bullet in any store.
So the avibilty plays an important role in what people use.

Al