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Rifles, Reloading, Optics, Equipment
Gunsmithing
Uni Throater Question
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<blockquote data-quote="264MHC" data-source="post: 2681180" data-attributes="member: 111161"><p>So last August, I received a new 6.5 Grendel AR Barrel from McGowan. Overall it was very nicely done and they accommodated my requests for a specific length, gas system, and gas port diameter (12.7" mid with .093 port). When I went to start developing loads for it, I noticed I was having a lot of trouble getting consistent CBTO measurements to the lands, and the measurements seemed short. I have had 3 other 6.5 Grendel barrels so I kind of know what to expect. I then chambered some factory Hornady 123 AG with sharpie on the ogive. It chambered fine and didn't seem to be contacting the lands but they looked like this:</p><p></p><p>[ATTACH=full]416476[/ATTACH]</p><p></p><p>After seeing this, I called McGowen and sent them this picture. They agreed to take the barrel back to work on it. I disassembled my upper, sent them the barrel, and received it back two weeks later. No complaints on customer service. Problem is, I still get that mark on every bullet that goes through the chamber.</p><p></p><p>I decided I would just shoot it and clean it and maybe it wouldn't affect anything. I shot factory ammo through the gun exclusively, about 200 rounds, and it's still there. It doesn't seem to be causing over pressure or accuracy issues, which is surprising. I kind of forgot about it over the summer and I don't think sending the barrel back again is an option since its been over a year, my fault for not being more proactive. I also really don't want to disassemble and reassemble this upper again.</p><p></p><p>Anyway, my question is: Will a 6.5 Uni throater clean this up? I don't think I need much more length in the throat, but it is hard to tell since I can't get consistent measurements. Would the Uni-Throater stay straight since this imperfection is only on one side of the throat/freebore? I don't want to mess up the barrel beyond repair since there would be no way to set it back any. Suggestions? Other Solutions?</p></blockquote><p></p>
[QUOTE="264MHC, post: 2681180, member: 111161"] So last August, I received a new 6.5 Grendel AR Barrel from McGowan. Overall it was very nicely done and they accommodated my requests for a specific length, gas system, and gas port diameter (12.7" mid with .093 port). When I went to start developing loads for it, I noticed I was having a lot of trouble getting consistent CBTO measurements to the lands, and the measurements seemed short. I have had 3 other 6.5 Grendel barrels so I kind of know what to expect. I then chambered some factory Hornady 123 AG with sharpie on the ogive. It chambered fine and didn't seem to be contacting the lands but they looked like this: [ATTACH type="full" width="594px"]416476[/ATTACH] After seeing this, I called McGowen and sent them this picture. They agreed to take the barrel back to work on it. I disassembled my upper, sent them the barrel, and received it back two weeks later. No complaints on customer service. Problem is, I still get that mark on every bullet that goes through the chamber. I decided I would just shoot it and clean it and maybe it wouldn't affect anything. I shot factory ammo through the gun exclusively, about 200 rounds, and it's still there. It doesn't seem to be causing over pressure or accuracy issues, which is surprising. I kind of forgot about it over the summer and I don't think sending the barrel back again is an option since its been over a year, my fault for not being more proactive. I also really don't want to disassemble and reassemble this upper again. Anyway, my question is: Will a 6.5 Uni throater clean this up? I don't think I need much more length in the throat, but it is hard to tell since I can't get consistent measurements. Would the Uni-Throater stay straight since this imperfection is only on one side of the throat/freebore? I don't want to mess up the barrel beyond repair since there would be no way to set it back any. Suggestions? Other Solutions? [/QUOTE]
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