rc, yes I know its a weird gr. bullet. x-tream bullets puts it out as a reg 9 mm bullet. It has a standard dia. of .3555 per their webb site. I thought it would be a good bullet to practice with in my sig. I can't afford to practice with factory ammo. I have picked Federal hydra shok 147 gr jhp as my SD carry load . It shoots excellent in my sig, very accurate out to 25 yds, clean & very low flash, nice recoil as well. Yes I know there are others rated just as well as Federal. Thanks rc I may have to try your idea. k&j 223