Here is a 158 grain xtp that penetrated into 4 milk jugs. Velocity from a snub was around 1050. Expansion is .55 inches and retained weight it 154 grains. To be honest I believe that this bullet is the most accurate .357 diameter bullet that I have tried. Several groups from a 6 inch 586 have run under 2 inches at 50 yards. One group fired with 2400 out of Winchester nickel cases went under and inch.