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Rifles, Reloading, Optics, Equipment
Reloading
What do you see with virgin vs. once fired.
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<blockquote data-quote="Stokesrjsr" data-source="post: 2859635" data-attributes="member: 108548"><p>We test all of our bullet runs using virgin brass and seldom see anything greater than 1/2 MOA at 300 meters and rarely any standard deviations in velocity over 8-9 fps on five groups of five shots each. On the rare occasions that we reload once fired brass, I typically see no statistically significant difference in velocity or velocity standard deviations. I do occasionally see differences in precision with harder to tune bullets like the VLDs. I believe this is due to the fact that by reloading we are effectively changing the bolt face to ogive distance because the cartridge loaded in virgin brass can be driven further forward before the shoulder of the chamber stops the forward motion of the case and ignition is achieved. When resizing the once fired brass we don't return the shoulder to SAAMI dimensions, instead only moving it back .003" from the fired dimension. Some times we will see groups around 1/2 MOA drop to 1/4 MOA and other times get worse. </p><p>I still think the better policy is to do serious load development with once fired, and annealed brass to be able to accurately make the belts decisions in your load development.</p></blockquote><p></p>
[QUOTE="Stokesrjsr, post: 2859635, member: 108548"] We test all of our bullet runs using virgin brass and seldom see anything greater than 1/2 MOA at 300 meters and rarely any standard deviations in velocity over 8-9 fps on five groups of five shots each. On the rare occasions that we reload once fired brass, I typically see no statistically significant difference in velocity or velocity standard deviations. I do occasionally see differences in precision with harder to tune bullets like the VLDs. I believe this is due to the fact that by reloading we are effectively changing the bolt face to ogive distance because the cartridge loaded in virgin brass can be driven further forward before the shoulder of the chamber stops the forward motion of the case and ignition is achieved. When resizing the once fired brass we don’t return the shoulder to SAAMI dimensions, instead only moving it back .003” from the fired dimension. Some times we will see groups around 1/2 MOA drop to 1/4 MOA and other times get worse. I still think the better policy is to do serious load development with once fired, and annealed brass to be able to accurately make the belts decisions in your load development. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
What do you see with virgin vs. once fired.
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