Brad, Years back when Allen Day shot the two buffalo using his 300, the ammo was factory WW using 180gr Fail Safe bullets. We had many phone conversations about that hunt as well as the ones we made together. As for Echols not using freeborn in his Legends chambered to 300Wby, this is not completely true. He typically short throats them but one cannot load ammo that touches the lands and have it fit in his mag boxes. And they can handle most all of the Wby factory ammo w/o pressure troubles.
