I've had the same happen with my 50 cal. 295 grain powerbelt aerotips, 100 grains of pyrodex. Took a plastic milk crate, filled it with newspapers 14 inches thick, soaked them in the sink overnight, shot it at 100 yards expecting to find the slugs somewhere inside. All 3 shots passed clear through. Had to dig a foot into the dirt berm to find the slugs and they were barely deformed. My rifle really likes these bullets, drew a ml bull tag for September....not sure whatthey'll do in the field, but I have alot of confidence so far.