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Rifles, Reloading, Optics, Equipment
Reloading
Clean / Cold barrel runs faster?
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<blockquote data-quote="Pdvdh" data-source="post: 315476" data-attributes="member: 4191"><p>Roger that. That Oehler 35 if probably giving you very good data - it's top of the line in chronographs.</p><p></p><p>When I clean my bores, <u>not with a dry patch</u>, I mean clean back down to the bare steel, I have at times noted substantially lower velocity on the first clean bore shot. It was an eye opener to me, and helped explain why one should always enter the field to engage an animal at long range with a fouled bore. I figured it out when I took two different rifles to the range that I had already collected MVs for. When I fired the first shot out of the first rifle and saw how low the muzzle velocity was, I thought I had made an error and undercharged the case with powder. The next shot jumped up about 100 fps and fit right into the normal velocity range.</p><p></p><p>Low and behold the very same thing happened when I fired the first shot out of my second clean bore rifle. At that point the lightbulb came on!</p><p></p><p>Now - I will say that all barrels seem to be different and I don't see a 100 fps reduction in MV from all of my cleaned barrels. Some barrels aren't much different clean bore to fouled bore. But if I see any trend, it's that my clean bore shots trend toward slower MVs than the fouled bores.</p><p></p><p><em>Reason</em>? I have read that the carbon coating layed down in the fouled bore presents less friction to the bullet traveling down the bore than the bare steel itself. I wouldn't bet my life on this being the cause, but that's one explanation I have read most commonly in the past.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 315476, member: 4191"] Roger that. That Oehler 35 if probably giving you very good data - it's top of the line in chronographs. When I clean my bores, [U]not with a dry patch[/U], I mean clean back down to the bare steel, I have at times noted substantially lower velocity on the first clean bore shot. It was an eye opener to me, and helped explain why one should always enter the field to engage an animal at long range with a fouled bore. I figured it out when I took two different rifles to the range that I had already collected MVs for. When I fired the first shot out of the first rifle and saw how low the muzzle velocity was, I thought I had made an error and undercharged the case with powder. The next shot jumped up about 100 fps and fit right into the normal velocity range. Low and behold the very same thing happened when I fired the first shot out of my second clean bore rifle. At that point the lightbulb came on! Now - I will say that all barrels seem to be different and I don't see a 100 fps reduction in MV from all of my cleaned barrels. Some barrels aren't much different clean bore to fouled bore. But if I see any trend, it's that my clean bore shots trend toward slower MVs than the fouled bores. [I]Reason[/I]? I have read that the carbon coating layed down in the fouled bore presents less friction to the bullet traveling down the bore than the bare steel itself. I wouldn't bet my life on this being the cause, but that's one explanation I have read most commonly in the past. [/QUOTE]
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Reloading
Clean / Cold barrel runs faster?
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