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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Length and Bullet Velocity Ratio
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<blockquote data-quote="Kevin Thomas" data-source="post: 805234" data-attributes="member: 15748"><p>CB11WYO,</p><p> </p><p>Okay, I an this on QuickLoad, with the component combination you cited; Retumbo, Berger 180s in a 7mm Mag with a 26" and a 28" barrel. It showed a difference of about another 50 fps in the longer barrel, or about 25 fps per inch. This is about what I would have figured, but it could well change a bit with a different powder, different charge weights, etc.. As I said, it isn't linear, and will change with the variables in play. Ballpark figures of 20-40 fps per inch is usually the figure that gets bandied about, and it's roughly correct. </p><p> </p><p>Bottom line is, no matter what an interior program like QL says, it's the chronograph that will give you the final answer. Hope that helps.</p></blockquote><p></p>
[QUOTE="Kevin Thomas, post: 805234, member: 15748"] CB11WYO, Okay, I an this on QuickLoad, with the component combination you cited; Retumbo, Berger 180s in a 7mm Mag with a 26" and a 28" barrel. It showed a difference of about another 50 fps in the longer barrel, or about 25 fps per inch. This is about what I would have figured, but it could well change a bit with a different powder, different charge weights, etc.. As I said, it isn't linear, and will change with the variables in play. Ballpark figures of 20-40 fps per inch is usually the figure that gets bandied about, and it's roughly correct. Bottom line is, no matter what an interior program like QL says, it's the chronograph that will give you the final answer. Hope that helps. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel Length and Bullet Velocity Ratio
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