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Rifles, Reloading, Optics, Equipment
Gunsmithing
Match vs standard chamber
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<blockquote data-quote="Idgunner" data-source="post: 1376639" data-attributes="member: 84194"><p>JE, as I noted in my original post I've measured the lands with the Hornady tool and have verified that the lands have moved out 0.1000 from my original chamber. McGowen told me that they used a standard PTG 223 reamer and I have the design measurements for that tool. I sent dummy rounds off to Dave Manson and he has completed a design for a new 'match' reamer that I now have on order. </p><p>I measured the lands to find out why my groups were not consistent as they had been and found the discrepancy to the lands. This barrel has been an awesome barrel and is a 26 inch varmint style. My gunsmith and I have talked about it and we are going to cut off 3 threads, at 20 per inch that will equal .150 so when we cut the new chamber it will once again be right onto the lands. I've purposely asked for a minumum clearance to the lands with the Nosler bullets that I'm using and Dave has designed to that request. </p><p>In the meantime, realizing that the new chamber may very well be tighter than the handloads I have now I'm not reloading anything until I get the new chamber cut. </p><p>I appreciate all of these replies.</p></blockquote><p></p>
[QUOTE="Idgunner, post: 1376639, member: 84194"] JE, as I noted in my original post I've measured the lands with the Hornady tool and have verified that the lands have moved out 0.1000 from my original chamber. McGowen told me that they used a standard PTG 223 reamer and I have the design measurements for that tool. I sent dummy rounds off to Dave Manson and he has completed a design for a new 'match' reamer that I now have on order. I measured the lands to find out why my groups were not consistent as they had been and found the discrepancy to the lands. This barrel has been an awesome barrel and is a 26 inch varmint style. My gunsmith and I have talked about it and we are going to cut off 3 threads, at 20 per inch that will equal .150 so when we cut the new chamber it will once again be right onto the lands. I've purposely asked for a minumum clearance to the lands with the Nosler bullets that I'm using and Dave has designed to that request. In the meantime, realizing that the new chamber may very well be tighter than the handloads I have now I'm not reloading anything until I get the new chamber cut. I appreciate all of these replies. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Match vs standard chamber
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