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Rifles, Reloading, Optics, Equipment
Gunsmithing
Custom Rifle accuracy expectations??
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<blockquote data-quote="Bart B" data-source="post: 637944" data-attributes="member: 5302"><p>I don't know that.</p><p></p><p>That's not what I've observed wearing out several 30 caliber barrels. They all shot Sierra 168's, 180's, 190's and 200's in 1:11 twist barrels very accurate form bolt guns; 1/2 MOA or better at 600. That's with Hart and Obermeyer barrels. The four 7.62 NATO Springfield Armory 1:12 twist arsenal barrels in Garands I wore out shot .3082" diameter Sierra 168's, 180's, and 190's as well as .3092" diameter Lapua 185's into 2/3 MOA at 600 yards. These barrels had bore diameters of .298" to .299" and groove diameters of .3076 to .3079.</p><p></p><p>I'm convinced that the reason most folks feel that a given barrel shoots best with only one bullet weight and type is they don't shoot enough rounds per test group. If you shoot two groups with the same load in a given barrel and they're different sizes; you need to shoot more shots per group if you want a decent level of confidence of how accurate they are all the time. A good measurement of anything's OK when the result's the same time after time.</p></blockquote><p></p>
[QUOTE="Bart B, post: 637944, member: 5302"] I don't know that. That's not what I've observed wearing out several 30 caliber barrels. They all shot Sierra 168's, 180's, 190's and 200's in 1:11 twist barrels very accurate form bolt guns; 1/2 MOA or better at 600. That's with Hart and Obermeyer barrels. The four 7.62 NATO Springfield Armory 1:12 twist arsenal barrels in Garands I wore out shot .3082" diameter Sierra 168's, 180's, and 190's as well as .3092" diameter Lapua 185's into 2/3 MOA at 600 yards. These barrels had bore diameters of .298" to .299" and groove diameters of .3076 to .3079. I'm convinced that the reason most folks feel that a given barrel shoots best with only one bullet weight and type is they don't shoot enough rounds per test group. If you shoot two groups with the same load in a given barrel and they're different sizes; you need to shoot more shots per group if you want a decent level of confidence of how accurate they are all the time. A good measurement of anything's OK when the result's the same time after time. [/QUOTE]
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Custom Rifle accuracy expectations??
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