Wisconsin Cartridge Ammo

[OE139]

Over the weekend, I shot a bunch of Wisconsin Cartridge ammo loaded with 150 gr. bullets.  I had, "blown out" primers on four out of eighty rounds.  Has anyone else had this problem?  I didn't notice any other pressure signs on the cases. 

[SWshooter]

I had the same problem. It turned out to be bullets getting pushed back into the case when  chambered from the mag. I put all my uncrimped ammo through a Lee factory sizer snd that cured the problem. Thats why I recommend crimping all 308 ammo used in semi auto battle rifles.

[OE139]

That makes a lot of sense.  A couple of times I had double feeds and noticed that the bullet in the first cartridge out of the mag was hammered pretty good.  Thanks.