This happened on exactly 3 cases out of 100. Noticed it when i was looking them over. I went ahead and decapped the whole batch before i thought to get some opinions. No holes in the primers or brass, no pitting of the bolt, however there was a carbon buildup ring type circle on the boltface that cleaned right off. I scratched across the bolt face with a needle and could detect no pitting or etching to speak of when i cleaned the carbon ring off. I am wondering if this is a WLR primer problem. Notice the very small soot ring around the very edge of the primer pocket. There was no sooting of the face of the casehead at all, this was a very very small amount of sooting, nothing like what i have seen on google images with small holes blown in the edge of the primer pocket/casehead and significant sooting across the casehead. Unfortunately I did not check the primers as I deprimed them to see if they had ruptured or split on the side. What do you guys think, should I pull the remaining 50 rounds I have loaded with this load or just an isolated primer quality problem?