Are there distinct rifling marks on the "stuck" bullets once you get them out? A smoked bullet in a
case (with no powder) will show you that quickly.) Bullet jam would have to be fairly egregious
to stick things as badly as you describe, and even then would tend to push the bullet further into
the case rather than jam the action shut. (You'd also likely pull the bullet out of the case upon
forcibly extracting it.)
If this isn't the case, I still suspect the seating die is squeezing the neck as the bullet is being pushed
in, and deforming the shoulder area ever so slightly.
Just for grins, see if you can find someone w/ an RCBS seating die and back that die off of
case contact by a full turn to see what happens.
Last edited by mehavey; July 5, 2012 at 12:28 PM.