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Rifles, Reloading, Optics, Equipment
Gunsmithing
recessed crown under barrel threads?
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<blockquote data-quote="Hired Gun" data-source="post: 942825" data-attributes="member: 1290"><p>JE,</p><p>Have you ever really looked for the change in bore diameter? I found it by accident. I had a custom in from another smith with a brake on it for a barrel inspection. I cleaned it and visually inspected it and found nothing remarkable about the bore. I moved on to slugging it to check uniformity of the bore and found that it was really tight right in the brake threads. I loosened the brake and that cleared the constriction. That was how I discovered the bore constriction thing and then I went looking for it on every thread job. The best thread fit there is makes no difference. If the brake is torqued too tight it will constrict the bore. I can find it with bushings. Before you thread find the largest that will still go and when you are done with the brake job see if it will still fit. I found the small thin walled thread jobs were really susceptible to it. I originally just started not using so much torque but then had one come loose on a guy after a couple hundred rounds. So now rather than relying fully on torque I use blue Loctite on the thinner barrels.</p></blockquote><p></p>
[QUOTE="Hired Gun, post: 942825, member: 1290"] JE, Have you ever really looked for the change in bore diameter? I found it by accident. I had a custom in from another smith with a brake on it for a barrel inspection. I cleaned it and visually inspected it and found nothing remarkable about the bore. I moved on to slugging it to check uniformity of the bore and found that it was really tight right in the brake threads. I loosened the brake and that cleared the constriction. That was how I discovered the bore constriction thing and then I went looking for it on every thread job. The best thread fit there is makes no difference. If the brake is torqued too tight it will constrict the bore. I can find it with bushings. Before you thread find the largest that will still go and when you are done with the brake job see if it will still fit. I found the small thin walled thread jobs were really susceptible to it. I originally just started not using so much torque but then had one come loose on a guy after a couple hundred rounds. So now rather than relying fully on torque I use blue Loctite on the thinner barrels. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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recessed crown under barrel threads?
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