300 WM loose primer pocket

[kcbird]

Here is the deal Remington 700 Douglas barrel 300 win mag Sierra 190 gr. HPBT 68.5 grns of IMR 4350 Winchester magnum primers Norma brass. I have this load worked up to the correct velocity to train for work purposes. My Norma brass has been fired 3 times and is going into its fourth reload and the primer pockets are loose. I noticed they were loose when hand priming, and popped one out when loading the bullet in. I wasn’t expecting the Norma brass to perform miracles, but I was expecting 6 reloads out of it not 3.

The case head is not showing signs of over pressure. I would like to keep the load I have because it is very accurate and mirrors the factory ammo I use. I am considering switching to a cheaper brass just to see how it performs.

Should I be expecting this from my load's pressure? I'm not seeing the normal signs I look for.

Let me know what you think, appreciated the help. (if I’m a dumbass tell me I’m a dumbass I can take it)

 

[EOD350]

I shoot that powder with 190's as well, but at 66.0 grains getting 3025 fps. The velocity is right as I used two chrono's and both read the same. I am on my seventh firing with WW cases. I'm gonna haul off and say your loads to hot for the brass and you likely have more loose pockets than you realize.