I have only used CCI Primers thus far, but loaded up 20 rounds of my usual 30-06 load with WLR primers this time and decided to Crono them to see if it affected my load (58gr IMR 4831 under 168 gr A-Max). This was in some Federal Brass that has been reloaded 5 times. I noticed that the WLR primers were not seating as tight (hand priming tool) as the CCI primers. They were seated though and didn't back out any when seating the bullet. Yes the difference in force needed to prime was enough to make me check but everything was fine and I chalked it up to the WLR primers being made with a softer material. Well sure as ----, 12th WLR round decided to blow a pin hole along side the primer. I looked at the brass and got ----ed and threw the casing off a cliff near me and immediately regretted not saving it after I inspected my rifle to find a very deep pit in the bolt face ( I am glad I didn't end up with hot gas in my face, Thanks Tikka ). What I don't understand is how this can happen. Seems to me the Primer would recoil into the bolt face and seal around the primer hole vs blowing a hole like that. I did a quick google search and others have had WLR primers do the same thing. So my question is to any experienced reloaders out there: Is this a known issue with WLR primers? Federal Brass? Where might I have gone wrong, perhaps I need to inspect primer pockets better or not use WLR primers if they don't seem to seal as tight as the CCI primers do? All the rounds with CCI primers went in tight as usual, so I figured the brass was fine and the WLR used a softer (brass) cup, was this my mistake?