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Re: Groove diameter

Posted by Tom Trevor on Tuesday, 12 August 2014, at 10:48 p.m., in response to Groove diameter, posted by Duane Spyer on Tuesday, 12 August 2014, at 3:27 p.m.

Duane, I am sure your barrel is at least .460 or larger in that the nominal bore is .450 with .005 deep rifling. The only way to measure the barrel is with a V anvil or internal expanding micrometer. That said you do not need the crimp what has worked best is to run your fired case into the sizing die 1/2 way then use a lyman M die to neck expand for your as cast bullet seating with the die off the seat enough to not crimp you case. You mentioned on the other site where they can not even spell bullet using 70 grains the arsenal found the most accurate load was 65 grains but used 70 to flaten the trajectory out a bit.Be sure to use a powder compression die before seating the bullet. Hope this helps


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