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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
BC and engraving on the bullet - More lands and grooves or less?
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<blockquote data-quote="Lefty7mmstw" data-source="post: 1078633" data-attributes="member: 48043"><p>Logic suggests that it would be more of a rotational drag change... i.e. how much the air resistance slows the bullet spin. You could eventually end up with a bc change due to bullet wobble induced my marginal stability (and therefore degraded bc) though. I doubt the results could show more than a minor difference though at the ranges shoulder fired rifles are capable of.</p><p> </p><p>The only other difference I can think of is the fact that a rather tight barrel will likely make the bullet obdurate at a slightly smaller diameter than a worn/loose barrel. The resulting difference in diameter would cause the tighter barrel to make the bullet grow compared to the looser barrel. That could change bc with a possibly lesser frontal area on the narrower bullet. Again, basically a fart in the breeze in most cases.... </p><p>I know when my brother owned a 460 s&w he was fond of swaging (.458") 420gr hardcast to .452" for the pistol. Those bullets grew one eighth of an inch when swaged.</p></blockquote><p></p>
[QUOTE="Lefty7mmstw, post: 1078633, member: 48043"] Logic suggests that it would be more of a rotational drag change... i.e. how much the air resistance slows the bullet spin. You could eventually end up with a bc change due to bullet wobble induced my marginal stability (and therefore degraded bc) though. I doubt the results could show more than a minor difference though at the ranges shoulder fired rifles are capable of. The only other difference I can think of is the fact that a rather tight barrel will likely make the bullet obdurate at a slightly smaller diameter than a worn/loose barrel. The resulting difference in diameter would cause the tighter barrel to make the bullet grow compared to the looser barrel. That could change bc with a possibly lesser frontal area on the narrower bullet. Again, basically a fart in the breeze in most cases.... I know when my brother owned a 460 s&w he was fond of swaging (.458") 420gr hardcast to .452" for the pistol. Those bullets grew one eighth of an inch when swaged. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
BC and engraving on the bullet - More lands and grooves or less?
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