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Rifles, Reloading, Optics, Equipment
Reloading
Run-out: what do you do?
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<blockquote data-quote="Canadian Bushman" data-source="post: 982611" data-attributes="member: 41122"><p>It makes a big difference where along the bullet you measure and how long your bullet petrudes from the case. Typically we roll the case and compare the bullets center with the understood center of the case, the further you project this tolerance the worse it appears. I say that because if the case isnt round or true, and even if the head isnt perpendicular sometimes this shows up as runout, and then this awful looking case lines up better in the chamber then it appeared it would. </p><p></p><p>I think if the majority of your loads run within .002-.003" TIR you are doing really well. I also believe that unless the load is finely tuned and you are shooting for group at a pretty distant target, you wont be able to detect the difference. In my experiments shooting a round that ran out .005-.007" in sequence with a group of cases that ran out .002-.003" i couldnt detect which one was which on the target. This was with my load and my equipment shooting 800-1000 yards with bullets measured halfway between the bearing surface and meplat on a .308 win case with a COAL of 3.2"</p></blockquote><p></p>
[QUOTE="Canadian Bushman, post: 982611, member: 41122"] It makes a big difference where along the bullet you measure and how long your bullet petrudes from the case. Typically we roll the case and compare the bullets center with the understood center of the case, the further you project this tolerance the worse it appears. I say that because if the case isnt round or true, and even if the head isnt perpendicular sometimes this shows up as runout, and then this awful looking case lines up better in the chamber then it appeared it would. I think if the majority of your loads run within .002-.003" TIR you are doing really well. I also believe that unless the load is finely tuned and you are shooting for group at a pretty distant target, you wont be able to detect the difference. In my experiments shooting a round that ran out .005-.007" in sequence with a group of cases that ran out .002-.003" i couldnt detect which one was which on the target. This was with my load and my equipment shooting 800-1000 yards with bullets measured halfway between the bearing surface and meplat on a .308 win case with a COAL of 3.2" [/QUOTE]
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Reloading
Run-out: what do you do?
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