Superb accuracy and explosive expansion on varmints made TNT famous. CCI TNT .17 HMR 17 Grain Rimfire Ammo was designed from the ground up as a premier rimfire varmint cartridge, featuring a 17-grain hollow-point bullet that moves out at a sizzling 2,550 fps. CCI’s tight quality control in manufacturing eliminates variables that cause inconsistencies, resulting in reliable rimfire ammo that delivers consistent accuracy from one box to the next. Premier rimfire varmint cartridge 17-grain hollow-point bullet Sizzling 2,550 fps. Explosive results