I have been using Kent fasteel for three seasons now, using 3 1/2 BBB, BB, 2's on canada geese, snow geese and ducks and it seem to be doing fine, they shoot good out of my Browning, and just as well out of my SBEII. as far as penetration I have had no trouble, in fact I have seen holes thru 12 lbs geese, and have taken one head off a goose at 20 yards.