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Rifles, Reloading, Optics, Equipment
Reloading
270 WSM 165gr VLD load help
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<blockquote data-quote="AlexF" data-source="post: 505770" data-attributes="member: 33207"><p>You should use the bullet SD and look at a similar bullet which would be an hypotical 7mm 175 VLD or Matrix's 7mm 190gr VLD. <ol> <li data-xf-list-type="ol">Looking at Berger 7mm (0.277") target bullets: 168 VLD is .316 G7 and 180 VLD is .337 G7 so the <strong>0.277" 165 VLD can be estimated at .326 G7</strong> (or .636 G1).</li> <li data-xf-list-type="ol">Another way to get an estimation is to use the same form factor as Matrix's 7mm 190 VLD (0.978) and divide the bullet SD (.307) by this number <strong>G7 BC = .307 / 0.978 = 0.313 G7 (or .613 G1).</strong></li> </ol><p><strong>I'm Canadian so for me Matrix has to be as good as Berger, therefore 165gr VLD BC is .326 G7 (or .636 G1) <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></strong></p><p> </p><p>One important note, VLD as G7 shaped bullets while standard spitzer are G1 or G8 shaped bullets. <strong>You'll get much better calculations if you use G7 bullet model and G7 coefficient to calculate external ballistics.</strong></p><p> </p><p>In any case, run out and get a copy of Brian Litz's (Berger Bullet's ballistician "Applied Ballistics for Long Range Shooting 2n Edition"</p><p> </p><p>Alex</p></blockquote><p></p>
[QUOTE="AlexF, post: 505770, member: 33207"] You should use the bullet SD and look at a similar bullet which would be an hypotical 7mm 175 VLD or Matrix's 7mm 190gr VLD. [LIST=1] [*]Looking at Berger 7mm (0.277") target bullets: 168 VLD is .316 G7 and 180 VLD is .337 G7 so the [B]0.277" 165 VLD can be estimated at .326 G7[/B] (or .636 G1). [*]Another way to get an estimation is to use the same form factor as Matrix's 7mm 190 VLD (0.978) and divide the bullet SD (.307) by this number [B]G7 BC = .307 / 0.978 = 0.313 G7 (or .613 G1).[/B] [/LIST][B]I'm Canadian so for me Matrix has to be as good as Berger, therefore 165gr VLD BC is .326 G7 (or .636 G1) ;)[/B] One important note, VLD as G7 shaped bullets while standard spitzer are G1 or G8 shaped bullets. [B]You'll get much better calculations if you use G7 bullet model and G7 coefficient to calculate external ballistics.[/B] In any case, run out and get a copy of Brian Litz's (Berger Bullet's ballistician "Applied Ballistics for Long Range Shooting 2n Edition" Alex [/QUOTE]
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270 WSM 165gr VLD load help
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