Sorry but outside of penetration, I don't see what the 10mm does that the .40 doesn't already do for all practical purposes. For self defense, I don't need more than the .40 S&W or the .45 ACP. For the woods, I want more that what the 10mm has to offer. It's a good cartridge in it's own right but I can't justify the cost and recoil when the .40 or .45 does everything I need them to do without the cost, recoil, bulk, and the sever potential for over penetration. To sum it up, my personal feeling on the 10mm is it's too much for the two legged critters and too little for the four legged ones. Too much in one case and not (or barely) enough in the other. I just never saw what the 10mm could do for me that cartridges slightly larger or slightly smaller couldn't do already. The 10mm was a solution in search of a problem and was more of a bastard round than the .40 S&W IMHO.