Look at my brass.

[XP1K]

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.

 

[wvfarrier]

I have had ejector marks on lower end book loads. I ignore them unless I see metal peeling. Sticky bolt, flattening or cratering are better indicators

 

[supercorndogs]

300wm brass tends to be short in the shoulder since it headspaces off the belt. It can cause kind of an ejector mark when firing new brass.

 

[XP1K]

300wm brass tends to be short in the shoulder since it headspaces off the belt. It can cause kind of an ejector mark when firing new brass.

You know, I had forgotten all about that. This was once fired through a friend's 700 5r and his chamber is about .010" shorter than mine. I resized it through my die but I'm sure it's still short.

 

[918v]

It’s fine