Thread: Case head separation

Originally Posted by 6x47

Well "partial" doesn't accurately describe the approach. It would be better to say correct or appropriate headspacing.

The method doesn't necessarily require shoulder gauges. Start by dismantling or at least fully unwinding the spring tension in the bolt. Starting with too little sizing on a case that is slightly tight after firing, slowly wind the die in until the bolt will close with basically no resistance on bolt closing. This will get a more correct amount of resizing. Eric Cortina has a video on it from memory.

or to put it another way...you place resizing die in press as per normal but instead of winding in the extra 1/3---1/2 a turn you back it out 3 turns..... put fired case in shell holder and move handle as normal....remove case and try in rifle...still tight..so screw die down half turn and go again...keep doing this till bolt closes with no risistance....yes the bench shooting guys like a LITTLE resistance but for me,for hunting,I like it to shut with only tiniest hint of resistance if any at all..nothing worse than hunting all day and having big fat deer looking and laughing at you fighting to get bolt shut on oversized round!!!!
set the locking ring on die,dont forget to tighten wee grub screw....try another half dozen cases to make sure you have got it right....and leave the plurry thing alone from then onwards.
the ONLY time my .270w dies get moved is the seating die if using my 170grn fence posts..cannot unscrew top enough so have to back die out to seat them long enough to be happy.
if wanted I will take photo of the picture/diagram if some one wants it...