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Long Range Hunting & Shooting
Rl26 28 nosler 180 eldm
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<blockquote data-quote="sable tireur" data-source="post: 2495101" data-attributes="member: 27307"><p>By changing your altitude to 2,000 feet this is the change calculated:</p><p></p><p>[ATTACH=full]355492[/ATTACH]</p><p></p><p>This is not an indication that the bullet will be 'unstable' as in landing on the paper in a slight keyhole shape.</p><p></p><p>These calculations demonstrate what happens to the BC of the chosen bullet when a lessor or greater twist is used. By changing your elevation to 2,000 feet, your required twist difference is 1/2" from the factory 1:9.5" or 1:9" twist. The amount of BC you lose is reduced but should be taken into account for your drop/drift chart. </p><p></p><p>Generally speaking, Re-26 (one of my favorite powders) will simply not fill the case as much for greater consistency before hitting the top pressure. It doesn't make it a bad choice but slightly slower powders will perform better.</p><p></p><p>VVN-568</p><p>Norma 217</p><p>H-1000</p><p>Retumbo (you won't make top velocities)</p><p>Re-33</p><p></p><p>All will fill the case better while supplying the upper end of the velocity range.</p><p></p><p>I understand the powder supply issue. Just chant the reloader's mantra while working with any new loads:</p><p></p><p>'Start low and work up slowly watching for any signs of pressure.'</p><p></p><p>Above all, have fun and ENJOY!</p><p></p><p><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="sable tireur, post: 2495101, member: 27307"] By changing your altitude to 2,000 feet this is the change calculated: [ATTACH type="full"]355492[/ATTACH] This is not an indication that the bullet will be 'unstable' as in landing on the paper in a slight keyhole shape. These calculations demonstrate what happens to the BC of the chosen bullet when a lessor or greater twist is used. By changing your elevation to 2,000 feet, your required twist difference is 1/2" from the factory 1:9.5" or 1:9" twist. The amount of BC you lose is reduced but should be taken into account for your drop/drift chart. Generally speaking, Re-26 (one of my favorite powders) will simply not fill the case as much for greater consistency before hitting the top pressure. It doesn't make it a bad choice but slightly slower powders will perform better. VVN-568 Norma 217 H-1000 Retumbo (you won't make top velocities) Re-33 All will fill the case better while supplying the upper end of the velocity range. I understand the powder supply issue. Just chant the reloader's mantra while working with any new loads: 'Start low and work up slowly watching for any signs of pressure.' Above all, have fun and ENJOY! :) [/QUOTE]
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Rl26 28 nosler 180 eldm
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