Im not saying the problem isnt a primary extraction issue with the rifle, Im guessing it is but you might have an uphill battle getting it resolved. Anyone that has delt with the rem 700 action has probably seen similar, they can work ok to a point but beyond that they can give problems.
With regard to the case resizing, Ill try and explain it as Harvrey Westland did for me. If you havnt heard of Harvey he was a well respected gunsmith and competition shooter from Christchurch,
All chambers and dies are built to a tolerance, so plus or minus a few thou, If you get a chamber on the tight side and a die on the large side then the brass isn't getting the right amount of resizing. Normally this isn't an issue, plenty of reloaders just neck size and it works fine but occasionally the combination does enough to allow the case to chamber but not enough for it release, weak primary extraction will obviously exacerbate the problem as will warmer loads etc. It often gets worse the more times the brass is reloaded Its tough trying to problem solve like this so its a matter of trying things and the way you are describing it leads me to think its worth a try so I'm suggesting this as a possible workaround. I wouldn't buy a SB die until you've tried it and if you have time and want to send some cases down Im happy to run them through a SB die but as i said it wont be for a while.
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