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Long Range Hunting & Shooting
Test-Effect of Brushing Necks vs Graphite vs Both on ES
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<blockquote data-quote="RD57" data-source="post: 1840142" data-attributes="member: 103010"><p>In 2010 I tried the sorting of cases by velocity experiment and I found it to be a waste of time, bullets and powder. In my simple experiment I used weight sorted Winchester 243 brass from the same lot. It was pretty awesome getting 35 out of 50 pieces of brass within .3 grains of each other. From that group I used 20 pieces of brass that was within .2 grains of each other. After fireforming the brass and full length sizing with a .002 bump on the shoulder I went to work with my experiment. Long story short, I found that proper neck tension and carefully weighed powder charges (to the kernel) the most important part of the low ES/SD equation. Proper neck tension is a loaded topic as it covers many variables. For my experiment optimum results depended upon annealing every other load, lightly brushing/cleaning the interior case neck and determining what degree of sizing on the neck my rifle/bullet/powder combo wanted. I've settled on annealing after 3 firings, lightly brushing interior of neck (1 pass with bore brush) before resizing on my hunting loads. I routinely get single digit SDs with my 270 Winchester and ESs from 14 to 11 fps. The cases used in my 270 are weight sorted to within .7 grains of each other for a total spread of 1.4 grains.</p><p></p><p>Looking through my notes I found that bullet seating depth or more specifically the distance the ogive was from the lands played an important role in low ES as well. With this rifle and bullet/powder combo by moving the bullet .020" either way affected accuracy and ES. In my experience I don't think you will see a measurable improvement with ESs or accuracy by varying neck tension until after you have a proven load combination that performs well in that rifle.</p></blockquote><p></p>
[QUOTE="RD57, post: 1840142, member: 103010"] In 2010 I tried the sorting of cases by velocity experiment and I found it to be a waste of time, bullets and powder. In my simple experiment I used weight sorted Winchester 243 brass from the same lot. It was pretty awesome getting 35 out of 50 pieces of brass within .3 grains of each other. From that group I used 20 pieces of brass that was within .2 grains of each other. After fireforming the brass and full length sizing with a .002 bump on the shoulder I went to work with my experiment. Long story short, I found that proper neck tension and carefully weighed powder charges (to the kernel) the most important part of the low ES/SD equation. Proper neck tension is a loaded topic as it covers many variables. For my experiment optimum results depended upon annealing every other load, lightly brushing/cleaning the interior case neck and determining what degree of sizing on the neck my rifle/bullet/powder combo wanted. I've settled on annealing after 3 firings, lightly brushing interior of neck (1 pass with bore brush) before resizing on my hunting loads. I routinely get single digit SDs with my 270 Winchester and ESs from 14 to 11 fps. The cases used in my 270 are weight sorted to within .7 grains of each other for a total spread of 1.4 grains. Looking through my notes I found that bullet seating depth or more specifically the distance the ogive was from the lands played an important role in low ES as well. With this rifle and bullet/powder combo by moving the bullet .020" either way affected accuracy and ES. In my experience I don't think you will see a measurable improvement with ESs or accuracy by varying neck tension until after you have a proven load combination that performs well in that rifle. [/QUOTE]
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Test-Effect of Brushing Necks vs Graphite vs Both on ES
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