The problem sounds like a die set-up problem. Do a basic resizing die set-up as outlined in the instructions. At this point it is likely that the issue will be solved, if so then you can start backing the die out a bit at a time until you find the proper resizing adjustment for your chamber.

These instructions should get you to where you need to be - http://pdf.textfiles.com/manuals/FIREARMS/forster_benchrestdies.pdf

drover

223 Rem, my favorite cartridge - you can't argue with truckloads of dead PD's and gophers.

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