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Freebore Rifling?
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<blockquote data-quote="Ekupp" data-source="post: 2869457" data-attributes="member: 104593"><p>The photo is not the best, I have a video that would show better the situation, link below. The "etching" was not there prior to firing the rifle. The 2 etched lied start at one end of the free bore and run straight in to the lands (only 2/5). The etching appears to be the same wear that you see in the rifling. They even have a slight twist/angle that would indicate they were part of the lands that were not properly machined smooth or as Wapitibob indicated shows a lack of concentricity. I do not have any other barrels that show bullet contact in the free bore prior to the lands.</p><p></p><p>In the video you will see powder, in the chamber as well as concentric circles in the freebore. The rough circles left over from machining are not an issue if no contact with the bullet, they are a catalyst for fire cracking though and in my opinion should not be there. </p><p></p><p>As for velocity, I agree, 40 rounds is too early to tell, with that said, I have 4 other barrels from this manufacturer and they say you do not need to break in their barrels and that has largely been true, from shot one they have all been within ball park of expected velocity not 150 fps off. Also if the barrel requires handloading to get any reasonable results something is not right. PRC is designed to be OK to good accuracy if barrel and ammo are reasonably within tolerance. Especially when using the ammo from the designer of the cartridge.</p><p></p><p>Factory ammo could be the velocity issue especially when seeing powder in chamber. I do not have a way to check concentricity accuracy but when rolled it does not appear to have any hops and would not account for being that </p><p></p><p>My main issue is accuracy, velocity is another issue that may or may not be related. Finally, rifle was sent to manufacturer, had to start somewhere, not expecting much but will see what they find.</p><p></p><p><a href="https://drive.google.com/file/d/119jwazizbk7G6KKoQ4PdxTc568_pgXYJ/view?usp=drive_link" target="_blank">Video</a></p></blockquote><p></p>
[QUOTE="Ekupp, post: 2869457, member: 104593"] The photo is not the best, I have a video that would show better the situation, link below. The "etching" was not there prior to firing the rifle. The 2 etched lied start at one end of the free bore and run straight in to the lands (only 2/5). The etching appears to be the same wear that you see in the rifling. They even have a slight twist/angle that would indicate they were part of the lands that were not properly machined smooth or as Wapitibob indicated shows a lack of concentricity. I do not have any other barrels that show bullet contact in the free bore prior to the lands. In the video you will see powder, in the chamber as well as concentric circles in the freebore. The rough circles left over from machining are not an issue if no contact with the bullet, they are a catalyst for fire cracking though and in my opinion should not be there. As for velocity, I agree, 40 rounds is too early to tell, with that said, I have 4 other barrels from this manufacturer and they say you do not need to break in their barrels and that has largely been true, from shot one they have all been within ball park of expected velocity not 150 fps off. Also if the barrel requires handloading to get any reasonable results something is not right. PRC is designed to be OK to good accuracy if barrel and ammo are reasonably within tolerance. Especially when using the ammo from the designer of the cartridge. Factory ammo could be the velocity issue especially when seeing powder in chamber. I do not have a way to check concentricity accuracy but when rolled it does not appear to have any hops and would not account for being that My main issue is accuracy, velocity is another issue that may or may not be related. Finally, rifle was sent to manufacturer, had to start somewhere, not expecting much but will see what they find. [URL='https://drive.google.com/file/d/119jwazizbk7G6KKoQ4PdxTc568_pgXYJ/view?usp=drive_link']Video[/URL] [/QUOTE]
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