I was out trying a new recipe in my Knight Disc 50 cal 2 days ago and when I removed the used primer from the gun I noticed that the centers of the primer was basically destroyed. In one case the center was separated from the outer rim. Could this be bad primers?? I was shooting 80 grains of T7 FFFg and Hornady SST in 300 grains. I quit shooting after 4 shots because of the primer situation. Any suggestions??