Probably the reloads. (It's a headspace issue) More like you pushed the case shoulders back too far, firing pin pushes the case forward in the chamber and you end up with softer/lite primer strike.
Pull the bullets out a bit to increase the OAL with the bullets set to a slight jam into the lands. Once the round goes BANG, it has been formed to that chamber. (it could take a couple of firings to get full form) See if that fired brass will fit in the chamber and the bolt closes easy. If so, do a partial resize, more neck than anything and push the primer out. Load it up and go shooting. Then, make sure you don't push those shoulders back too far. .0015 to .002 is enough. Report back on the results.