I reload 44 mag.with the speer plastic cap. I load .177 pellets in the capsules and fill in around them with #6 or #8 shot.The pellets will keyhole and will do lots of damage. I have shot several rattlesnakes with this load and it seems to shock their systems so they don't jump around and strike after being hit as would a 22 or small round.This load is a great home or vehicle defense round.