Sounds like you were sizing the case just enough to squeeze the body and elongate the case body a bit. You've gotta adjust the sizing die down just a bit more to hit the shoulder and bump it back 0.003" or so, and feeding should be smooth as silk.
I think you're correct. On my next loading I'm going to bump the shoulders back .003. The .001 bump was obviously not enough and I don't want to have chambering issues when I'm 250 miles from home. I usually chamber every hand load after reloading, but didn't this time. If I had, I would have found the problem sooner.
