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Clean out the sizing die and polish insides with a little 0000 steel wool wrapped around an old bore brush . Final polish with J-B Bore Compound smeared on the brush/steel wool which should slick up the insides nicely ... be sure and clean out all polishing compound .
If still having problems ...size in steps . Size 1/2 way on the first pass then adjust die down to full length size .
I had some 303 British military cases that had been fired in WWII Machine Gun... I had to size in 3 steps . If case gets hard going into the sizing die... STOP ...it will be just as hard to remove from the die ... and that's when the rim rips off !!!
Gary
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