I don't know what model SIG this was, but it was a 9mm and had a plastic frame. This happened last night. I was in the training room which is adjacent to the range when it happened. It happened about 1/2 way through a box of the shooter's reloads. The shooter told me he was using a 115 grain plated bullet, 4.3 grains of Tight Group, and a standard primer. I didn't catch what brand of brass he was using, but I don't think it would have mattered. The shooter was very lucky. He got a couple of lacerations on his face, but went back to shooting with a different gun. There was no damage to his shooting glasses. If he was struck in his eyes, without glasses, he would have had serious eye damage. Also, our range just did some improvements about a year ago that included Lexan partitions between shooting stations. Without these partitions, the shooters on either side could have been seriously injured. It is my uneducated guess that this was a significantly overcharged round. It was loaded on a Square Deal B and the shooter has been reloading for about a year and a half. I don't know what sequence of events could cause this with a SDB as I have no experience with it. This was not a simple case blow-out. I'm sorry for my crappy cellphone pics: Wanna kill these ads? We can help!