I'd have to give a nod for the Mashburn, have one on an old Lee Enfield action. Great little cartridge for varmits and can fire a lot of rounds from 1 lb of powder. Using 15.5 gr. of IMR 4227 and am running 3025 fps with a 45 gr. Hornady, just loaded some 40 gr. Nosler Ballistic tips (15.7 gr. 4227), but haven't cronographed them yet.