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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 win mag, 300 win mag, or 300 weatherby mag?
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<blockquote data-quote="Bart B" data-source="post: 795336" data-attributes="member: 5302"><p>With a good barrel well fitted to a proper bedded action, I've not seen significant difference beween cold, clean barrels' first shot; even up to 1000 yards, and those fired thereafter. At most, a 1/4 MOA error in elevation. Windage errors are mostly caused by bad corrections for drift. </p><p></p><p>But letting a round cook in a hot chamber will make it go high from leaving faster. One should fire a chambered round within 20 seconds else the hotter powder puts the bullet out faster. Point of impact with my 30 caliber rifles climed about 1/4 MOA per 25 to 35 seconds of time the round rested in the chamber.</p><p></p><p>Same for dirty barrels except the first two shots typically have a bit slower muzzle velocity, but no more than 1/4 MOA below group center of the remaining shots in a 5-, 10- or 20-shot string.</p></blockquote><p></p>
[QUOTE="Bart B, post: 795336, member: 5302"] With a good barrel well fitted to a proper bedded action, I've not seen significant difference beween cold, clean barrels' first shot; even up to 1000 yards, and those fired thereafter. At most, a 1/4 MOA error in elevation. Windage errors are mostly caused by bad corrections for drift. But letting a round cook in a hot chamber will make it go high from leaving faster. One should fire a chambered round within 20 seconds else the hotter powder puts the bullet out faster. Point of impact with my 30 caliber rifles climed about 1/4 MOA per 25 to 35 seconds of time the round rested in the chamber. Same for dirty barrels except the first two shots typically have a bit slower muzzle velocity, but no more than 1/4 MOA below group center of the remaining shots in a 5-, 10- or 20-shot string. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 win mag, 300 win mag, or 300 weatherby mag?
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