DoubleTap 357Sig rounds (*supposedly* 125gr Sierras but don't look like Sierras) that I personally chrono'd at 1452fps average. However, the ES was 154fps. Maybe that's why the ES was so high, not to mention the accuracy sucking? What would cause a handgun bullet to keyhole? Now, before you ask, I checked to rule out barrel causes. I have both a Glock 32 factory barrel as well as a 4" Storm Lake drop-in barrel and it keyholed with both. Checked again by using Cor Bon Sierras, Buffalo Bore GD, and Speer GD, which all gave nice round holes. The DT was in the perfect outline of a bullet profile with just about every round. More than a little disappointed by DT, as many here have been. Not the velocity in this case but perhaps even worse. So, just out of curiosity, what would a tumbling 125gr bullet at 1452fps do ballisitcs-wise? No doubt it wouldn't act like a normal HP would, but would it be destructive? Hell, might as well be a tumbling FMJ in that case. Wanna kill these ads? We can help!