I have shot both 295gr. and 348gr. copper clad aerotip Powerbelts at elk. The first 348gr. was out of an old rifle with bad powder and it keyholed and passed completely through the elk sideways. Elk walked 20 yards and fell dead. Bullet went through both lungs and the center of the heart. Aerotip was still in the bullet and except for the missing cup the bullet could have been shot again. I shot an elk this year with a 295gr. and it passed completely through the rib cage and exited so I don't know if it expanded. It made a pretty fair sized exit hole. Only got one lung and a piece of the liver so the elk went a little further. Had to do a finish shot up close. They shoot well but I'm not so sure the performance is a dramatic as maybe a barnes. Some claim to have had expansion with this bullet but I can't prove it.