Thread: 7mm Rem Mag sizing problems

Originally Posted by veitnamcam

Check overall case lenght of resized brass is in spec. You do not want it tight on the mouth of the neck in the chamber!
It sounds like you jave a largish chamber and when you squeeze that body brass back in it has to go somewhere and it pushes the shoulder forward.Check it is actually tight on the shoulder and if so wind die down an 1/8th of a turn at a time untill the bolt handle just closes with very light pressure.If you cannot get anymore sizeing you may need to grind or machine a touch off of the bottom of the die to let the case enter it further.

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I had this with my AI dies, had 20thou ground off shellholder and was sweet as from then on