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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Estimating BC ....help!
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<blockquote data-quote="Brown Dog" data-source="post: 100470" data-attributes="member: 1622"><p>Got 50rds of 308 Geco 170gr target ammo for which I'm having trouble finding / estimating a 'starting point' BC to put me 'in the Parish' before I launch any downrange tomorrow. </p><p></p><p>They have good ogives but flat tips….....I'm confused!!</p><p>(yes, despite appearances,they are marketed as target bullets).</p><p></p><p>What would you estimate (I believe they are flat base)??:</p><p></p><p>Geco in the middle, 165gameking on left (0.404), 165NBT on right (0.475)……the ogives appear similar….just the tips seem different: </p><p><img src="http://i19.photobucket.com/albums/b162/thebrowndog/gecowithnbtandgmkcloseup.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p>The ogive is looks too good to class them with the Sierra Prohunter 170 FN (BC: 0.204).</p><p></p><p>Some more views of the Geco 170gr tip:</p><p></p><p></p><p><img src="http://i19.photobucket.com/albums/b162/thebrowndog/geco1bulletside.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://i19.photobucket.com/albums/b162/thebrowndog/geco1bulletoblique.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p></p><p>Anyone got anything more edumacated than (0404 + 0.475 + 0.204)/3 = 0.361 ?</p><p></p><p></p><p>Thanks!</p></blockquote><p></p>
[QUOTE="Brown Dog, post: 100470, member: 1622"] Got 50rds of 308 Geco 170gr target ammo for which I’m having trouble finding / estimating a ‘starting point’ BC to put me 'in the Parish' before I launch any downrange tomorrow. They have good ogives but flat tips….....I’m confused!! (yes, despite appearances,they are marketed as target bullets). What would you estimate (I believe they are flat base)??: Geco in the middle, 165gameking on left (0.404), 165NBT on right (0.475)……the ogives appear similar….just the tips seem different: [img]http://i19.photobucket.com/albums/b162/thebrowndog/gecowithnbtandgmkcloseup.jpg[/img] The ogive is looks too good to class them with the Sierra Prohunter 170 FN (BC: 0.204). Some more views of the Geco 170gr tip: [img]http://i19.photobucket.com/albums/b162/thebrowndog/geco1bulletside.jpg[/img] [img]http://i19.photobucket.com/albums/b162/thebrowndog/geco1bulletoblique.jpg[/img] Anyone got anything more edumacated than (0404 + 0.475 + 0.204)/3 = 0.361 ? Thanks! [/QUOTE]
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Estimating BC ....help!
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