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Rifles, Reloading, Optics, Equipment
Reloading
Need help with shoulder bumping!
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<blockquote data-quote="RoadKill" data-source="post: 1060727" data-attributes="member: 29136"><p><span style="font-family: 'Cambria'"><span style="font-size: 12px">If you use a completely gutted bolt body for feeling out case fit then you'll not have to determine if all the resistance you're feeling is from closing the bolt on brass completely filling the base to shoulder length of the chamber, or whether maybe some or even all of it is from battling the geometry and spring loaded mechanicals going on within the cocking and/or ejector mechanisms.</span></span></p><p> </p><p><span style="font-family: 'Cambria'"><span style="font-size: 12px">Find what number your implements will give you checking brass that's right at zero clearance in your chamber. Knowing that, now you can adjust the die to size the brass to just under that number so it'll give you at least some clearance on up to .002", or thereabouts. A cheap calculator will tell you quick how far one turn or a fraction of a turn will move a 7/8"-14 threaded die in or out of the press. One turn moves the die ~ .071", 1 turn / 14 threads per inch = .0714". One eighth of one full turn will change the die's adjustment by ~ .009" or 1/14/8 = .0089". Using this calculator math you can easily cipher for any fraction of a turn, 1/4th turn does 1/14/4 = .0179", 1/8th turn does 1/14/8 = .0089", and if you want to adjust the die by only one measly thousandth of an inch, all you got to do is crank it exactly 1/64th of a turn or 1/14/64 = .0011". Redding's Competition Shell Holder sets are workin' real good, easy die adjustments in .002" increments.</span></span></p><p> </p><p><span style="font-family: 'Cambria'"><span style="font-size: 12px">Any case crush on closing the bolt is induced stress I'd rather avoid.</span></span></p></blockquote><p></p>
[QUOTE="RoadKill, post: 1060727, member: 29136"] [FONT=Cambria][SIZE=3]If you use a completely gutted bolt body for feeling out case fit then you’ll not have to determine if all the resistance you’re feeling is from closing the bolt on brass completely filling the base to shoulder length of the chamber, or whether maybe some or even all of it is from battling the geometry and spring loaded mechanicals going on within the cocking and/or ejector mechanisms.[/SIZE][/FONT] [SIZE=3] [/SIZE] [FONT=Cambria][SIZE=3]Find what number your implements will give you checking brass that’s right at zero clearance in your chamber. Knowing that, now you can adjust the die to size the brass to just under that number so it’ll give you at least some clearance on up to .002”, or thereabouts. A cheap calculator will tell you quick how far one turn or a fraction of a turn will move a 7/8”-14 threaded die in or out of the press. One turn moves the die ~ .071”, 1 turn / 14 threads per inch = .0714”. One eighth of one full turn will change the die’s adjustment by ~ .009” or 1/14/8 = .0089”. Using this calculator math you can easily cipher for any fraction of a turn, 1/4th turn does 1/14/4 = .0179”, 1/8th turn does 1/14/8 = .0089”, and if you want to adjust the die by only one measly thousandth of an inch, all you got to do is crank it exactly 1/64th of a turn or 1/14/64 = .0011”. Redding’s Competition Shell Holder sets are workin’ real good, easy die adjustments in .002” increments.[/SIZE][/FONT] [SIZE=3] [/SIZE] [FONT=Cambria][SIZE=3]Any case crush on closing the bolt is induced stress I’d rather avoid.[/SIZE][/FONT] [/QUOTE]
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Need help with shoulder bumping!
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