30-378 Weatherby Mag Norma TipStrike 170gr Polymer Tip 3160 fps 20rdsNorma TipStrike . 30 378 Weatherby Magnum unleashes extreme velocity and devastating stopping power for long range big game hunting. This 170 grain polymer tipped bullet features a heat treated polymer tip for instant reliable expansion, thin jacket for aggressive mushrooming, mechanical locking system to prevent core jacket separation, and flat base for consistent aerodynamicsdelivering deep penetration, massive wound channels, and high energy