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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
RSI Shooting Lab
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<blockquote data-quote="AJ300MAG" data-source="post: 69891" data-attributes="member: 444"><p>Brent,</p><p></p><p>I cut the case at the center on a lathe to insure the case was square. I use your same procedure to find the position of the chamber that you do, except I have a set of collars that I can slip on my cleaning rod and lock in place. I use the collars to check O.A.L of cartridges. I have a jag that is faced square, close the bolt on the half cartridge, slide the rod into the bore, lock the collar at the muzzle. When I remove the rod I can place the collar against the muzle (O.D. of the collar is big enough) and scribe a line on the barrel to locate the strain gauge. The barrel isn't tapered at this point, so I can get a very accurate measurement of the barrel O.D. On the .270WSM, I did read the instructions /ubbthreads/images/graemlins/grin.gif and place the gauge an extra .125" foward to the muzzle to get the gauge 3/8" away from the reciever ring. Haven't had the time to shoot it just yet, I'm getting ready for the benchrest season here.</p><p></p><p>Al</p></blockquote><p></p>
[QUOTE="AJ300MAG, post: 69891, member: 444"] Brent, I cut the case at the center on a lathe to insure the case was square. I use your same procedure to find the position of the chamber that you do, except I have a set of collars that I can slip on my cleaning rod and lock in place. I use the collars to check O.A.L of cartridges. I have a jag that is faced square, close the bolt on the half cartridge, slide the rod into the bore, lock the collar at the muzzle. When I remove the rod I can place the collar against the muzle (O.D. of the collar is big enough) and scribe a line on the barrel to locate the strain gauge. The barrel isn't tapered at this point, so I can get a very accurate measurement of the barrel O.D. On the .270WSM, I did read the instructions [img]/ubbthreads/images/graemlins/grin.gif[/img] and place the gauge an extra .125" foward to the muzzle to get the gauge 3/8" away from the reciever ring. Haven't had the time to shoot it just yet, I'm getting ready for the benchrest season here. Al [/QUOTE]
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