I am trying to decide between the 124gr+p and the 147gr Federal HST ammo. Which would perform better in terms of penetration and expansion in my Kahr PM9 (3" barrel)? I know the general wisdom is to use lighter bullets for shorter barrels, but I have recently heard that in the case of some loads, the heavier bullet stays longer in the barrel and the powder combusts more completely. Any informed info regarding the Federal HST in short-barreled handguns (free of mere speculation, please) would be most welcome!