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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Cold bore shot vs dirty bore shot
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<blockquote data-quote="LouBoyd" data-source="post: 643534" data-attributes="member: 9253"><p>Typically lower engraving forces result in lower velocity though it can go either way. Shooting with a "clean" barrel vs a fouled barrel with everything at the same temperature should show if that's the problem. A clean but lightly lubricated barrel can perform very different from a clean dry barrel. I prefer to not clean a barrel if I'll use it again soon. I'd never shoot a match without sighter/fouling shots where they're allowed. Sighting and fouling shots can be just as useful for hunting. </p><p></p><p> The temperature of the powder in each cartridge at the time it's fired will also effect their velocity Firing a rifle can also effect the point of impact relative to the point of aim from thermal bending of the barrel, action, base, rings, or scope. With simple tests at a range with a chronograph and a little thought the cause of point of impact movement can be sorted out. </p><p></p><p>I've taken a heat gun to the range a few times to find stubborn thermal sensitivity problems. They make sense after your find them. Having a steel action and an aluminum scope at different and varying temperatures tightly tied at two locations with rigid rings is just asking for bending problems, particularly if the bases don't fit the action properly.</p></blockquote><p></p>
[QUOTE="LouBoyd, post: 643534, member: 9253"] Typically lower engraving forces result in lower velocity though it can go either way. Shooting with a "clean" barrel vs a fouled barrel with everything at the same temperature should show if that's the problem. A clean but lightly lubricated barrel can perform very different from a clean dry barrel. I prefer to not clean a barrel if I'll use it again soon. I'd never shoot a match without sighter/fouling shots where they're allowed. Sighting and fouling shots can be just as useful for hunting. The temperature of the powder in each cartridge at the time it's fired will also effect their velocity Firing a rifle can also effect the point of impact relative to the point of aim from thermal bending of the barrel, action, base, rings, or scope. With simple tests at a range with a chronograph and a little thought the cause of point of impact movement can be sorted out. I've taken a heat gun to the range a few times to find stubborn thermal sensitivity problems. They make sense after your find them. Having a steel action and an aluminum scope at different and varying temperatures tightly tied at two locations with rigid rings is just asking for bending problems, particularly if the bases don't fit the action properly. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Cold bore shot vs dirty bore shot
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