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Long Range Hunting & Shooting
Expected accuracy of featherweight contour
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<blockquote data-quote="nksmfamjp" data-source="post: 2386715" data-attributes="member: 1951"><p>Thanks for giving so much data to review.</p><p></p><p>My notes:</p><p>IMR 4064</p><p>Seat depth</p><p>2.806 - 1.0" 5 shot @ 41.4gr</p><p>2.836-2.776" - 1.3"</p><p></p><p></p><p></p><p>Charge</p><p>43.9 - 0.7" @ 2.806 3 shot</p><p>45.1, 45.5- 13ES horizontal strings</p><p></p><p></p><p>Seat depth @44.9gr</p><p>All crap 2.816", 2.806" best</p><p></p><p>VARGET</p><p></p><p>Charge</p><p>44.8 - 2.810" - 0.5" 3 shot</p><p>44.0 - 45.2 sub moa</p><p>43.2 - 1 es</p><p>44.4 - 10 es</p><p>45.6 - 12 es</p><p></p><p>Seating depth @ 44.4</p><p>2.816" sd 6.1 grp 0.9</p><p>2.796" sd 15.6 grp 0.7</p><p></p><p>This bullet is shooting it's best around 2.796"-2.816". It is just a 0.75 moa bullet in that rifle. You probably need a new bullet to get smaller groups.</p><p></p><p>VARGET is giving you better and more consistent ES. The loads around 44-45 gr seem to be giving good results.</p><p></p><p>I'm not sure you don't have a primer issue. Your barrel, bedding and stock are very nice. You have some amazing 3 of 5 groups. This is usually an instability.</p><p></p><p>First, I would shoot 5 groups of 5 shots each with VARGET 44.4gr and 2.796" oal. Is that repeatable? Is Sd ok on 25 shots? …might repeat with the 2.816" load.</p><p></p><p>Then, I would try seating the current primers to 0.003" crush. Basically, measure 5 primer pocket depths and 5 primer thicknesses. Then subtract to find nominal depth. Then add in some crush like 0.002-0.004". Try to make this consistent.</p><p></p><p>Then I would try a batch of new primers and do an ocw from 43.5 - 45.5gr. Did flyers and sd improve? If so, keep new primers.</p><p></p><p>Last, I would try a 3 bullets at 3 seating depths off lands at like 44.4 charge weight….was one of those consistently better?</p><p></p><p>Good luck.</p></blockquote><p></p>
[QUOTE="nksmfamjp, post: 2386715, member: 1951"] Thanks for giving so much data to review. My notes: IMR 4064 Seat depth 2.806 - 1.0" 5 shot @ 41.4gr 2.836-2.776" - 1.3" Charge 43.9 - 0.7" @ 2.806 3 shot 45.1, 45.5- 13ES horizontal strings Seat depth @44.9gr All crap 2.816", 2.806" best VARGET Charge 44.8 - 2.810" - 0.5" 3 shot 44.0 - 45.2 sub moa 43.2 - 1 es 44.4 - 10 es 45.6 - 12 es Seating depth @ 44.4 2.816" sd 6.1 grp 0.9 2.796" sd 15.6 grp 0.7 This bullet is shooting it’s best around 2.796”-2.816”. It is just a 0.75 moa bullet in that rifle. You probably need a new bullet to get smaller groups. VARGET is giving you better and more consistent ES. The loads around 44-45 gr seem to be giving good results. I’m not sure you don’t have a primer issue. Your barrel, bedding and stock are very nice. You have some amazing 3 of 5 groups. This is usually an instability. First, I would shoot 5 groups of 5 shots each with VARGET 44.4gr and 2.796” oal. Is that repeatable? Is Sd ok on 25 shots? …might repeat with the 2.816” load. Then, I would try seating the current primers to 0.003” crush. Basically, measure 5 primer pocket depths and 5 primer thicknesses. Then subtract to find nominal depth. Then add in some crush like 0.002-0.004”. Try to make this consistent. Then I would try a batch of new primers and do an ocw from 43.5 - 45.5gr. Did flyers and sd improve? If so, keep new primers. Last, I would try a 3 bullets at 3 seating depths off lands at like 44.4 charge weight….was one of those consistently better? Good luck. [/QUOTE]
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Expected accuracy of featherweight contour
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