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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Velocity dropping each shot?
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<blockquote data-quote="Pdvdh" data-source="post: 737413" data-attributes="member: 4191"><p>I've not experienced this with my rifles. Place them in a -5F freezer overnight with ammo. Pull them out and shoot over the chronograph, which is at normal outdoor air and operating temperatures - say 60F. Velocities haven't increased to any significant extent. The more common result, and greater magnitude of change, is a decrease in velocity. But not by 100 fps. </p><p></p><p>Tighter bores usually result in decreased velocity. Lilja barrels have a reputation for being a little tighter than some others, with a corresponding reduction in MV at maximum loads, compared to looser barrels at their maximum charge loads. Increasing the pressure in the bore by increasing the friction factor (resistance) going down the bore isn't generally a beneficial use of the energy of the expanding powder gases. </p><p></p><p>I suppose others may, occasionally, have a different experiences. There are quite a few variables in-play. Those experiences could be due to cold temperatures affecting the chronographs, as extreme cold is known to affect the accuracy and reliability of chronographs.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 737413, member: 4191"] I've not experienced this with my rifles. Place them in a -5F freezer overnight with ammo. Pull them out and shoot over the chronograph, which is at normal outdoor air and operating temperatures - say 60F. Velocities haven't increased to any significant extent. The more common result, and greater magnitude of change, is a decrease in velocity. But not by 100 fps. Tighter bores usually result in decreased velocity. Lilja barrels have a reputation for being a little tighter than some others, with a corresponding reduction in MV at maximum loads, compared to looser barrels at their maximum charge loads. Increasing the pressure in the bore by increasing the friction factor (resistance) going down the bore isn't generally a beneficial use of the energy of the expanding powder gases. I suppose others may, occasionally, have a different experiences. There are quite a few variables in-play. Those experiences could be due to cold temperatures affecting the chronographs, as extreme cold is known to affect the accuracy and reliability of chronographs. [/QUOTE]
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Velocity dropping each shot?
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