Some months ago I fired several different bullets into gallon milk jugs. The Speer GDs all made beautiful mushrooms and stopped in the 3rd jug (9mm out of a Glock 19, .45 out of a Glock 30.) The .357 out of my SP101(snubby) must have expanded pretty violently in the first jug because it splattered my shooting bag, glasses and clothes. It still went into the 3rd jug. However, I was very disappointed that the Hornady 125 gr XTP out of my wifes little Smith 642 (.38 spec) didn't expand at all and went into the 5th jug. I picked that round for her because at 7 yards it left 1 hole for 5 rounds with a laser sight. I guess that round would be better left to a 4" or better barrel.