Since we seem to have quite a few which is the best bullet questions I thought I’d pose this. It might be fun and educational. I recently read somewhere, maybe the 1911 Forum or even here, about an exercise to put some thought into the caliber wars that I believe if I read and remember correctly was poised by a Guns and Ammo writer. You are placed in a small, locked room and every 5 minutes a 250 pound felon who is in excellent shape and armed with a large, sharp knife comes in with the intent of killing you, this happens 10 times, 1 felon every 5 minutes. You have your choice of defensive handgun in either 9mm or .45acp, you only have 10 rounds total. So let’s add a 10mm defensive pistol to the above scenario, you have 10 rounds and the 250 pound felon has been doing lot’s of forearm exercise’s and bicep curls and you have to shoot through that beefy arm and you only have 1 round per felon. What will you choose and why? To be clear, you can choose either 9mm, .45acp or 10mm and you have 1 round per felon, you choose the caliber and load, the barrel length of your defensive pistol is 5" or less.