Was wondering why some of my 209 primers have the center blown back towards the bolt and some don't after I fire them. CCI's and Remington Kleanbores have done this on 2 rifles. As ahandloader for centerfire, I'm thinking pressureis the culprit. But I'm only using 80-90 grains of Pyrodex and I don't crush the bullet in real tight. Any ideas?

Like you, I would guess it is the back pressure from the breech. As for why one does it and one does not could also have something to do with the design of the 209, the design of the breech, how well you seal the breech, or the chicken crossed the road. I really don't know.

I normally shoot Remington Kleenbore Primers in my Knight and CVA. Sometimes, Winchester W209's. Both if them do it. Sometimes the primer will just be dented and the next time blown apart. As for the amount of powder you use, I seen it happen with less powder and not happen with a lot more powder.

As long as the rifle fires and the spent primer does not jam the action I guess it is something I just learn to live with.

My Magbolt does the same thing. I have seen it with loads as low as 60 to 70 grains and a PRB to loads as high as 400gr and 120gr of powder. I am convinced it has something to do with the BP design. More than 75% of the primers shot in that gun are deformed in one way or another. It worried me at first but after well over 500 rounds through the gun I just accept it as normal. BTW, what kind of gun are you shooting?

cayugad, That's kind of what I thought, no adverse affects, just an interesting phenomenon to live with.

dmurphy, I have 2 CVA's, Buckhorn & Elkhorn models. Bought a 44 cal cap & ball pistol this month....That makes 3 ml's I've bought this year. Does that mean I'm addicted?

Yes!

I am not sure if I understand your observation. I switched from the kleenbores to 777 primers. The kleenbores I guess would get hot and cause them to start pinching after a while. After about the fifth load, I would have to pick them out. The 777 fall out plusthey do reduce the "ring".