It's been touted as the best self-defense round ever created. That package in a semi-auto platform only sounds dynamic to me. If I was looking at a Sig it's the only round I would consider. I saw a test where a guy shot a 9mm, a 45 and a 357 into three water soaked phone books. Two types of bullets were used with the 357. The 9mm and 45 only went into the 2nd phone book. The 357 blew through all three books and the round wasn't recovered. The damage to the last phone book was to extensive for any further testing. The exit hole from the 357 was horrifying. I'll take the Sig in .357 thank you!