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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
what is the best crown?
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<blockquote data-quote="Bart B" data-source="post: 656229" data-attributes="member: 5302"><p>In my opinion, there's 3 reasons why any given bullet shoots better with the same load data in 1 out of 2 or more barrels all chambered with the same reamer fit to the same receiver that stocked the same way each time for each barrel. This eliminates all the variables except the barrel.</p><p></p><p>One's the groove diameter's equal to or larger than the bullet's diameter in the barrels that don't shoot too accurate. Groove diameters need to be a tiny bit smaller than bullet diameters; even as much as 1.5 thousandths smaller will shoot such bullets extremely accurate.</p><p></p><p>Another's the bore and groove measurements. Inaccurate barrels lapped and verified to perfect diameter dimensions most often have twists that aren't as consistant from leade to muzzle; a frequent issue with twist-gain barrels. Or there's other bore and groove dimensional issues</p><p></p><p>And finally, the chamber in the good barrel was better centered in the bore as its pilot matched the barrel's bore diameter and ended up with a better aligned chamber to the bore at its front end where it counts the most.</p><p></p><p>When variables other than the barrel's involved, accuracy comparison's a total waste of time, at least the way I figure all this stuff out.</p></blockquote><p></p>
[QUOTE="Bart B, post: 656229, member: 5302"] In my opinion, there's 3 reasons why any given bullet shoots better with the same load data in 1 out of 2 or more barrels all chambered with the same reamer fit to the same receiver that stocked the same way each time for each barrel. This eliminates all the variables except the barrel. One's the groove diameter's equal to or larger than the bullet's diameter in the barrels that don't shoot too accurate. Groove diameters need to be a tiny bit smaller than bullet diameters; even as much as 1.5 thousandths smaller will shoot such bullets extremely accurate. Another's the bore and groove measurements. Inaccurate barrels lapped and verified to perfect diameter dimensions most often have twists that aren't as consistant from leade to muzzle; a frequent issue with twist-gain barrels. Or there's other bore and groove dimensional issues And finally, the chamber in the good barrel was better centered in the bore as its pilot matched the barrel's bore diameter and ended up with a better aligned chamber to the bore at its front end where it counts the most. When variables other than the barrel's involved, accuracy comparison's a total waste of time, at least the way I figure all this stuff out. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
what is the best crown?
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