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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Shocked at how much throat erosion
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<blockquote data-quote="Alan Griffith" data-source="post: 184206" data-attributes="member: 4686"><p>GG,</p><p></p><p>When I first obtained the barrel last October, I had Ian Jensen over at Barnes Bullets (he's no longer with Barnes) chamber, thread, crown and mount it into my Rem 700 action. By November I started shooting. I started with 180 AB's and Rel 25. I fired a couple of bore break-in rounds and took my base measurements. I have a steel rod with two sliding rod stops which can be tightend down via knurled set screws. With a dirty barrel (per Glen Zediker) I use the steel rod to first run it in from the muzzle agaist the face of the bolt, lock the set screw on the rod stop and move the whole afair back about 8". I then gently placed one 180 AB into the chamber and with a fiberglass rod pushed the bullet up against the barrels throat. Working back and forth between the steel rod from the muzzle end and the fiberglass rod from the chamber end and the bullet in the middle, I was able to repeat the procedure, each time tightening down the 2nd steel rod stop. Each time I would take inside measurements between the two rod stops to get my OAL (bullet tip to base of case). I would then seat that same bullet into a primerless case to measure the same OAL. I would then take the Stoney Pt tool to obtain case base to ogive. Both figures were inscribed onto the side of the case for future reference. Now, almost 700 rounds later I take the same exact measurements and come up .13" longer. I thought my first figures were off so I double checked by running the rod measurements again. Both the OAL and base to ogive measurements were, again, .13" difference. I have been known to have drain bammage and make mistakes. I will gladly run the tests again if someone wants me to.</p></blockquote><p></p>
[QUOTE="Alan Griffith, post: 184206, member: 4686"] GG, When I first obtained the barrel last October, I had Ian Jensen over at Barnes Bullets (he's no longer with Barnes) chamber, thread, crown and mount it into my Rem 700 action. By November I started shooting. I started with 180 AB's and Rel 25. I fired a couple of bore break-in rounds and took my base measurements. I have a steel rod with two sliding rod stops which can be tightend down via knurled set screws. With a dirty barrel (per Glen Zediker) I use the steel rod to first run it in from the muzzle agaist the face of the bolt, lock the set screw on the rod stop and move the whole afair back about 8". I then gently placed one 180 AB into the chamber and with a fiberglass rod pushed the bullet up against the barrels throat. Working back and forth between the steel rod from the muzzle end and the fiberglass rod from the chamber end and the bullet in the middle, I was able to repeat the procedure, each time tightening down the 2nd steel rod stop. Each time I would take inside measurements between the two rod stops to get my OAL (bullet tip to base of case). I would then seat that same bullet into a primerless case to measure the same OAL. I would then take the Stoney Pt tool to obtain case base to ogive. Both figures were inscribed onto the side of the case for future reference. Now, almost 700 rounds later I take the same exact measurements and come up .13" longer. I thought my first figures were off so I double checked by running the rod measurements again. Both the OAL and base to ogive measurements were, again, .13" difference. I have been known to have drain bammage and make mistakes. I will gladly run the tests again if someone wants me to. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Shocked at how much throat erosion
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