Interesting. RP is all I keep/scrounge for my .30-06. But then again, I weigh every shell for that gun after sizing/depriming/trimming and sort them by weight. Above or below certain thresholds I toss them in the recycle bucket. I'm only picky on the hunting guns. .223 and .30 Carbine - I'll load anything that isn't split, once it's trimmed.
Every FC I've seen lately in .30-30 seems to have loose primer pockets. Or they're using smaller primers. I had an entire box of 20 back the primers out .007" when I got my .30-30 last year. Caused me much concern, such that I disassembled the gun as far as I was comfortable, then re-assembled it and tightened a few otherwise previously loose screws on the inside. But those had nothing to do with the bolt or lockup, so I think it was the ammo. Also, I've seen quite a few more FC .30-30 shells in the last year fired from numerous other guns, and darn near everyone of them has the primers popped about the same distance.