overpressure with cow?

sorry was trying to make a funny about the rem brass......

im just trying to offer advice but im not expert fer sure....

i have 5 firings on my rem brass so far and all is good...then 1 day i figure i would crimp the bullet in with a bigger body die so it wouldnt touch the walls. what happen is it set the shoulder back also, and apon firing it left a real heavy ejector mark and noticble looser primmer compared to the others,so brass life will be shorter now on these 10 cases .

also i have found a tiny bit of lube on them during COW and the first full power load helps brass life for me ....
 
i did use the nosler brass for my first barrel but thought i would go to the lapua to see if it would last longer. the primer pockets started to get loose on the nosler after 5 -6 firings. as well the cost is quite a bit diferent, $80 for 50 nosler, $100 for 100 lapua
 
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