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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
SD, or ifSD?
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<blockquote data-quote="Michael Eichele" data-source="post: 816295" data-attributes="member: 1007"><p>Sectional density (as we use it in this context) is factored by two things. 1: Bullet weight 2: Bullet diameter. What ever the bullet weight/diameter is when it is in your hands may be slightly different when it exits the muzzle based on barrel dimensions and how bad it rakes copper off the jacket but you are splitting frog hair at this point. Smaller diameter bullets of equal weights of larger diameter bullets have higher sectional densities. The higher the sectional density, the more potential you have for a better BC. At least assuming you also have a good form factor. When it comes to equal weight + equal form factor, the higher the SD, the better the BC.</p><p></p><p>Shooting a 155 grain palma bullet in a Palma tight bore is not going to increase its sectional density and subsequent ballistic coefficient to any appreciable degree. </p><p></p><p>In theory, a 155 grain Palma bullet could change it by roughly 5% if it started out as a .308" diameter AND ended up exiting with a .300" dimension. That said, I'm no expert and I think the old Palma barrels (tight bore) were only .306ish. .300 might be a suicide mission.</p><p></p><p>Welcome to the forum.</p><p></p><p>M</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 816295, member: 1007"] Sectional density (as we use it in this context) is factored by two things. 1: Bullet weight 2: Bullet diameter. What ever the bullet weight/diameter is when it is in your hands may be slightly different when it exits the muzzle based on barrel dimensions and how bad it rakes copper off the jacket but you are splitting frog hair at this point. Smaller diameter bullets of equal weights of larger diameter bullets have higher sectional densities. The higher the sectional density, the more potential you have for a better BC. At least assuming you also have a good form factor. When it comes to equal weight + equal form factor, the higher the SD, the better the BC. Shooting a 155 grain palma bullet in a Palma tight bore is not going to increase its sectional density and subsequent ballistic coefficient to any appreciable degree. In theory, a 155 grain Palma bullet could change it by roughly 5% if it started out as a .308" diameter AND ended up exiting with a .300" dimension. That said, I'm no expert and I think the old Palma barrels (tight bore) were only .306ish. .300 might be a suicide mission. Welcome to the forum. M [/QUOTE]
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SD, or ifSD?
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