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Rifles, Reloading, Optics, Equipment
Gunsmithing
Uni Throater Question
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<blockquote data-quote="264MHC" data-source="post: 2682622" data-attributes="member: 111161"><p>Ya I think a bore scope is my next move. To be clear, I am very confident in my CBTO measurement technique. That is why I knew something was off with this barrel. The marks are in fact scratches in the bullet jacket that can be felt with a fingernail. They are visible without the sharpie on the ogive, just easier to see in a picture that way. There has to be something in the freebore like a burr. For example one of my standard loads is 27.5 AR Comp in Hornady brass with 123 ELD at 1.665 CBTO 2.25 Coal. This load has shot 1/2 to 3/4moa in 3 other Grendel barrels and was generally .035 +-.010 off the lands. In this barrel, this seating depth jambs in the lands and I had to drop it to 1.635 To not jamb. When checking this measurement with my standard method, measurements came out anywhere from 1.62 to 1.655. I believe this was the Burr showing false measurements. </p><p></p><p>I shot the rifle again today. Averaged around 1moa with Hornady AG and 3/4 with the above load. Pretty standard for that stuff. I also did some Velocity testing with 97 Hammer absolutes and some different powders.</p><p>The barrel is certainly functional and Isn't a dud by any means so I should probably not worry about it and just shoot, but I just can't stand knowing there is something not as good as it could be.</p></blockquote><p></p>
[QUOTE="264MHC, post: 2682622, member: 111161"] Ya I think a bore scope is my next move. To be clear, I am very confident in my CBTO measurement technique. That is why I knew something was off with this barrel. The marks are in fact scratches in the bullet jacket that can be felt with a fingernail. They are visible without the sharpie on the ogive, just easier to see in a picture that way. There has to be something in the freebore like a burr. For example one of my standard loads is 27.5 AR Comp in Hornady brass with 123 ELD at 1.665 CBTO 2.25 Coal. This load has shot 1/2 to 3/4moa in 3 other Grendel barrels and was generally .035 +-.010 off the lands. In this barrel, this seating depth jambs in the lands and I had to drop it to 1.635 To not jamb. When checking this measurement with my standard method, measurements came out anywhere from 1.62 to 1.655. I believe this was the Burr showing false measurements. I shot the rifle again today. Averaged around 1moa with Hornady AG and 3/4 with the above load. Pretty standard for that stuff. I also did some Velocity testing with 97 Hammer absolutes and some different powders. The barrel is certainly functional and Isn’t a dud by any means so I should probably not worry about it and just shoot, but I just can’t stand knowing there is something not as good as it could be. [/QUOTE]
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Uni Throater Question
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