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Rifles, Reloading, Optics, Equipment
Reloading
Clean / Cold barrel runs faster?
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<blockquote data-quote="Varmint Hunter" data-source="post: 315427" data-attributes="member: 313"><p>I shoot all of my loads over an Oehler 35P chronograph. Without exception, every gun I own will shoot slower with a clean barrel. Presumably, no fouling results in lower friction which causes decreased pressure and less velocity.</p><p></p><p>On average, it takes about 3 fouling rounds (sometimes more) to get velocity up and groups stable and predictable.</p><p></p><p>I also noticed that the chronograph can give different velocities, on different days, with identical loads, fired from the same rifle. I believe that this is caused by varying light conditions on different days but I'm not sure. I have seen loads vary by close to 100 ft/sec over several weeks of testing. For whatever it's worth, I did send the chronograph back to Oehler for testing and/or calibration but they said everything was right up to specs when they received it.</p></blockquote><p></p>
[QUOTE="Varmint Hunter, post: 315427, member: 313"] I shoot all of my loads over an Oehler 35P chronograph. Without exception, every gun I own will shoot slower with a clean barrel. Presumably, no fouling results in lower friction which causes decreased pressure and less velocity. On average, it takes about 3 fouling rounds (sometimes more) to get velocity up and groups stable and predictable. I also noticed that the chronograph can give different velocities, on different days, with identical loads, fired from the same rifle. I believe that this is caused by varying light conditions on different days but I'm not sure. I have seen loads vary by close to 100 ft/sec over several weeks of testing. For whatever it's worth, I did send the chronograph back to Oehler for testing and/or calibration but they said everything was right up to specs when they received it. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Clean / Cold barrel runs faster?
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