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Rifles, Reloading, Optics, Equipment
Reloading
Is there such a thing as too far off the lands?
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<blockquote data-quote="MagnumManiac" data-source="post: 1166316" data-attributes="member: 10755"><p>The measured distance from the rifling has no bearing on how accurate a barrel will be, but, if the bullet is too far into the case neck, it MAY cause pressures higher than normal just the same as a jammed bullet does.</p><p>There is no set in stone rule that a small jump is more accurate than a very long one. My Kimber 8400 Classic select, with mag box max COL 3.390" with a 180gr Accubond, has a jump of .145". It's accuracy is not affected by this because if I load 200gr Accubonds to be .020" off the rifling, shoots the same size groups, then if I load them at 3.385", groups open a little, but still good for a hunting rifle.</p><p></p><p>If you look at SAAMI specs, all cartridges have a maximum COL, which is not as important as long as the bullet isn't jammed, then there is a minmum COL, this is more important for the reasons outlined above.</p><p></p><p>Cheers.</p><p>gun)</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1166316, member: 10755"] The measured distance from the rifling has no bearing on how accurate a barrel will be, but, if the bullet is too far into the case neck, it MAY cause pressures higher than normal just the same as a jammed bullet does. There is no set in stone rule that a small jump is more accurate than a very long one. My Kimber 8400 Classic select, with mag box max COL 3.390" with a 180gr Accubond, has a jump of .145". It's accuracy is not affected by this because if I load 200gr Accubonds to be .020" off the rifling, shoots the same size groups, then if I load them at 3.385", groups open a little, but still good for a hunting rifle. If you look at SAAMI specs, all cartridges have a maximum COL, which is not as important as long as the bullet isn't jammed, then there is a minmum COL, this is more important for the reasons outlined above. Cheers. gun) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Is there such a thing as too far off the lands?
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