I was out at the range yesterday watching a buddy of mine shoot a 300 Ultra Mag. Hewas shootingsome hand loads, using a healthy charge of Retumbo, that he decided toload withsome CCI regular large rifle primers. Got a bunch of hang fires. Almost got to be funny after awhile. After checking the bolt assembly, I suggestedhe try some other loads. Both factory ammo and handloads loaded with theFederal 215's gave 100% reliability.