I have only used the 22 lr version and have nothing good to say, the rifling, unlike the smooth bore of a shotgun, causes the shot to exit a pistol/revolver barrel with a spin causing them to spread into a large pattern pretty quickly, this results in an almost instant loss of power.

I recall shooting a rattler at about a two foot range and the pellets failing to penetrate the scales, finally killed him with a rock. I guess it worked out because I did not have to worry about biting into any pellets when I had him for dinner that night!!!