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Rifles, Reloading, Optics, Equipment
Reloading
Why can't i reload exact cartridges?
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<blockquote data-quote="CanardNoir" data-source="post: 1574304" data-attributes="member: 64559"><p>You may just be over-thinking the matter of a digital-caliper-measured dimension as a preconceived & absolute determinant of accuracy from a given rifle.</p><p></p><p>During the 1960s, when "long range" was closer to 300 yards, we simply used a permanent magic marker combined with periodic (finished cartridge) sampling - to determine whether the bullets/projectile was being seated to the proper depth, with respect to the barrel's rifling. After all - the critical distance <em><u>IS</u></em> that much smaller engagement distance (for a given, acceptable tolerance) based upon uniformity for a given rifle & expected load pressure.</p><p></p><p>We did experiment with micrometers, fixed sell length gages, and the like, but we seemed to always return to our mark-n-scratch-n-adjust method, for and before a deeper or shallower seating. But accuracy was never significantly better, than with that initial, manual method of seating a given bullet.</p><p></p><p>Moreover - <strong>1) I'm not sure how you can accurately measure that small distance between the point of engagement with the rifling and a bullet's seated & chambered jacket</strong>; and <strong>2) any adjustment you make to seating depth is simply a function of the combined threading of the a) die to the press, and b) the (finer threading) adjustment of the seating depth of the die. And the machined threading of each may simply add two (2) or more additional variables to the dimension of the finished round - depending upon the press and die manufacturer's machine tolerance to ASTM and/or SAE standards</strong> <strong><em>i.e.</em> with respect to manual "adjustments".</strong></p><p></p><p>Back with that RCBS stuff I used, I still checked every fourth or fifth round, after I set the bullet seating die with my master for that rifle and load. Then I loaded 10-20 additional rounds... My personal accuracy then, has never been bettered...</p></blockquote><p></p>
[QUOTE="CanardNoir, post: 1574304, member: 64559"] You may just be over-thinking the matter of a digital-caliper-measured dimension as a preconceived & absolute determinant of accuracy from a given rifle. During the 1960s, when "long range" was closer to 300 yards, we simply used a permanent magic marker combined with periodic (finished cartridge) sampling - to determine whether the bullets/projectile was being seated to the proper depth, with respect to the barrel's rifling. After all - the critical distance [I][U]IS[/U][/I] that much smaller engagement distance (for a given, acceptable tolerance) based upon uniformity for a given rifle & expected load pressure. We did experiment with micrometers, fixed sell length gages, and the like, but we seemed to always return to our mark-n-scratch-n-adjust method, for and before a deeper or shallower seating. But accuracy was never significantly better, than with that initial, manual method of seating a given bullet. Moreover - [B]1) I'm not sure how you can accurately measure that small distance between the point of engagement with the rifling and a bullet's seated & chambered jacket[/B]; and [B]2) any adjustment you make to seating depth is simply a function of the combined threading of the a) die to the press, and b) the (finer threading) adjustment of the seating depth of the die. And the machined threading of each may simply add two (2) or more additional variables to the dimension of the finished round - depending upon the press and die manufacturer's machine tolerance to ASTM and/or SAE standards[/B] [B][I]i.e.[/I] with respect to manual "adjustments".[/B] Back with that RCBS stuff I used, I still checked every fourth or fifth round, after I set the bullet seating die with my master for that rifle and load. Then I loaded 10-20 additional rounds... My personal accuracy then, has never been bettered... [/QUOTE]
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Reloading
Why can't i reload exact cartridges?
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