Playing with 155.5 bergers in my 300winmag. Loaded three on the upper end of the scale just to look for the limit. Loade 73,74, and 75gr of H4350. Book max is 74.
My chamber was built around the 215 so I'm jumping them almost 1/4"
With the long freebore there I was fairly comfortable with that 1gr over max.
Velocities as follows.
73gr- 3270
74gr- 3326
75gr- 3393
Left to right, 73, 74, 75. All showing slight ejector marks, which 73, and 74 kind of surprised me. The primers don't really look bad on any of them though. No resistance on the bolt lift whatsoever.
My chamber was built around the 215 so I'm jumping them almost 1/4"
With the long freebore there I was fairly comfortable with that 1gr over max.
Velocities as follows.
73gr- 3270
74gr- 3326
75gr- 3393
Left to right, 73, 74, 75. All showing slight ejector marks, which 73, and 74 kind of surprised me. The primers don't really look bad on any of them though. No resistance on the bolt lift whatsoever.