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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Prepping the big 300gr SMK???
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<blockquote data-quote="jb1000br" data-source="post: 115078" data-attributes="member: 1459"><p>[ QUOTE ]</p><p>I agree with GG and Shawn on every thing but one point the Tubbs bullet bearing surface comparitor is more precise than using 2 stoney point tools because it actualy measures the bearing surface of the bullet, the stoney point units are several thou under-sized and measure well ahead of the ogive and well behind the rear bearing surface. this is not really too much of a problem on most bullets as I use the 2 stoney points for every bullet I shoot EXCEPT the 300SMK, I think the BSC really makes a difference if shooting past a mile.</p><p>UB </p><p></p><p>[/ QUOTE ]</p><p></p><p>The "bearing surface" is not the caliber sized part of the bullet...</p><p></p><p>the comparitors should be undersized like the SP inserts are since the BORE diameter (groove minus rifling depth) is what you really want to measure...</p><p></p><p>The part that actually touches the barrel is closer to .330" than .338"...</p><p></p><p>I will call John Buhay and see what diameter he makes the holes in the bushings that Tubb sells as the BSC...my bet is 8 thou under caliber size...</p><p></p><p>JB</p></blockquote><p></p>
[QUOTE="jb1000br, post: 115078, member: 1459"] [ QUOTE ] I agree with GG and Shawn on every thing but one point the Tubbs bullet bearing surface comparitor is more precise than using 2 stoney point tools because it actualy measures the bearing surface of the bullet, the stoney point units are several thou under-sized and measure well ahead of the ogive and well behind the rear bearing surface. this is not really too much of a problem on most bullets as I use the 2 stoney points for every bullet I shoot EXCEPT the 300SMK, I think the BSC really makes a difference if shooting past a mile. UB [/ QUOTE ] The "bearing surface" is not the caliber sized part of the bullet... the comparitors should be undersized like the SP inserts are since the BORE diameter (groove minus rifling depth) is what you really want to measure... The part that actually touches the barrel is closer to .330" than .338"... I will call John Buhay and see what diameter he makes the holes in the bushings that Tubb sells as the BSC...my bet is 8 thou under caliber size... JB [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Prepping the big 300gr SMK???
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