Got a 6mm AI on the way and am new to fireforming. Is it better to use a fast powder/light bullet or heavy bullet/slow powder load? Does it matter? I realize this isn't a full blown wildcat but just looking for what others do. I picked up some new Remington brass(only thing I could find)and out of a bag of 50 I have 30 that weigh within a grain of each other. I'll use the others for break-in.