Benchrest primers vs. magnums

[RebelSquirrel]

Any of you guys get more fps on the chronie with the small rifle primers? more velocity with the same load using a small rifle magnum primer over a benchrest small rifle primer?

[AlbertaAl]

In the 223Rem., I've had a 20-30 fps increase with magnum primer.

[Stephen Perry]

NT, Like to hear some responses.

Stephen Perry
Angeles BR

[sicero]

Here a couple year ago when I couldn't get BR-4s, I called CCI and was informed the priming mix was the same as a standard 400 abiet a thinner cup. Kenny

[ackleyman]

BR-4's have the ignition characteristics of the 400 and the cup thickness of the 450.

Hope this helps!