.50 CAL. 300 GRAINPowerBelt Platinum Bullets are the ultimate PowerBelt Bullet. Using a plating process that actually changes the molecular structure (and color) of our copper plating, standard deviations in bullet velocity are lowered and accuracy is improved. A ribbed gas check gives an even better gas seal than standard PowerBelts, which increases velocity and, therefore, reduces bullet drop at longer ranges. A new bullet shape and a new AeroTip design improve ballistic performance… increases penetration and better controls expansion. Available in .45 and .50 calibers and in grain weights for both medium and big game.