I have an H&R Sportsman 22 with 6" barrel, that I inherited from my step-dad. It was made in 1972, by serial number. I need to know what I can safely shoot in the gun, without destroying it, me or anyone around me. I know magnums won't fit. Anyone with any experience that can tell me whether to use hyper, high or standard velocities or long rifles? Also, if leading would be a problem with the higher velocities? I would like for my wife to learn to shoot it for personal defense, at home, so I need to use the highest that the gun is capable of.