Check Mastercast's 100gr WC www.mastercast.net . It is almost like shooting .22. It will penetrate because it is a wadcutter, but I would not consider it to be a defense cartridge. It is a familiarization cartridge. Very little recoil or blast in my S&W 637 Airweight. Almost embarrassing to shoot at my range. I fired off 500 of them as a test and was very satisfied with the product -- except for its .22-like performance. I now shoot Mastercast's 148gr WCs by the thousands. They are reloads, so you can save a bundle by sending your spent brass in exchange. I can get about 2,000 .38sp and 9x19 spent brass cases into a ten buck USPS Priority Mail box. Any other way I know of costs twice as much.

Cordially, Jack