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300 WM loose primer pocket

kcbird

Who cares?
Full Member
Minuteman
Jul 8, 2009
621
1,319
TX
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)
 
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.