Barnes Precision Match OTM BT .300 Winchester Magnum 300 Grain Rifle Ammo has match grade OTM (Open Tip Match) projectiles, featuring lead cores, copper jackets, long boat tails, and super high ballistic coefficients (BC). High ballistic coefficients flatten trajectory, reduce wind drift, and retain velocity enhancing the shooter's ability to hit targets an ultra long range. Barnes manufactures Precision Match Centerfire Rifle Ammo exact quality standards to eliminate variables that cause inconsistencies, resulting in consistent accuracy from one box to the next. Match grade OTM bullets Lead core/copper jacketed Boat tail with high ballistic coefficients Manufactured to exact quality standards Excellent long-range ammo