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Proof barrel Issue
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<blockquote data-quote="gerpwaller" data-source="post: 2925738" data-attributes="member: 103698"><p>So, I'll try to be a bit clearer on what was done to the barrel. </p><p></p><p>The action end of the barrel was machined down a few thousandths and the reamer run through for a "fresh" chamber. And new threads were cut as the previous diameter of the threaded portion was a wider diameter than for a tikka action. </p><p></p><p>The exposed steel portion of the barrel was turned down to match the diameter of the tikka action. A portion of the CF was also turned down to match the diameter. </p><p></p><p>This may have induced stress to the barrel. Although, I'm not sure that it would induce much more than the initial cutting of a chamber? I suppose any amount of machining/milling has the potential to introduce stress to the barrel. </p><p></p><p>Regarding cutting the strands of carbon compromising the barrel integrity that is also possible. However, looking at the carbon pattern and profiles of proof and carbon six barrels I suspect that they are machined at the factory. Unlike barrels with a traditional style carbon weave the C6 and proof barrels are able to be machined. </p><p></p><p>After all machining/lathe work was done the exposed metal was cerakoted OD green following the cerakote guidelines prescribed by proof. </p><p></p><p>Again, I am very open to the possibility that we pooched what otherwise appeared to be a very good barrel. I do need to do further ammo testing (not with the federal TA ammo) to confirm the results. Since our target rigs only managed 2" 20 round groups with it. If you told me at the beginning of the process that it would only be a half moa worse than my target rifle I'd have been thrilled but 2.5" premium hunting ammo is not as good as I would have expected. </p><p></p><p>The big question is still why it seems to shoot accurately when it gets warm. I will have to do some more testing on that and also verify that the action is bedded stress free as that would be something that makes sense as an explanation to what I'm seeing. </p><p></p><p>Thanks for all your input so far guys. It is appreciated.</p></blockquote><p></p>
[QUOTE="gerpwaller, post: 2925738, member: 103698"] So, I'll try to be a bit clearer on what was done to the barrel. The action end of the barrel was machined down a few thousandths and the reamer run through for a "fresh" chamber. And new threads were cut as the previous diameter of the threaded portion was a wider diameter than for a tikka action. The exposed steel portion of the barrel was turned down to match the diameter of the tikka action. A portion of the CF was also turned down to match the diameter. This may have induced stress to the barrel. Although, I'm not sure that it would induce much more than the initial cutting of a chamber? I suppose any amount of machining/milling has the potential to introduce stress to the barrel. Regarding cutting the strands of carbon compromising the barrel integrity that is also possible. However, looking at the carbon pattern and profiles of proof and carbon six barrels I suspect that they are machined at the factory. Unlike barrels with a traditional style carbon weave the C6 and proof barrels are able to be machined. After all machining/lathe work was done the exposed metal was cerakoted OD green following the cerakote guidelines prescribed by proof. Again, I am very open to the possibility that we pooched what otherwise appeared to be a very good barrel. I do need to do further ammo testing (not with the federal TA ammo) to confirm the results. Since our target rigs only managed 2" 20 round groups with it. If you told me at the beginning of the process that it would only be a half moa worse than my target rifle I'd have been thrilled but 2.5" premium hunting ammo is not as good as I would have expected. The big question is still why it seems to shoot accurately when it gets warm. I will have to do some more testing on that and also verify that the action is bedded stress free as that would be something that makes sense as an explanation to what I'm seeing. Thanks for all your input so far guys. It is appreciated. [/QUOTE]
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