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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Determine if Barrel is "Shot" . . . ?
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<blockquote data-quote="AZShooter" data-source="post: 744247" data-attributes="member: 5219"><p>It you could get to a borescope you could find out a great deal about your barrel. My friend got one and it was a real eyeopener. After viewing many barrels and learning what each barrel required to clean it, I bought my own. It takes the mystery out of what works and what doesn't. You can spot trouble areas that accumulate more fouling than the rest of the barrel. </p><p></p><p>Example: I have a beautiful Bartlein 5R 1 in 7.5 twist 6mm-284. It was shooting very tight groups at 200 yds. One session the group size doubled. I cleaned it and it still shot poorly. My friend suggested we study the insides with his borescope. We discovered a dark residue clinging to the "corners" of the rifling 3-5" from the end of the 30" barrel. Some Iosso polishing done to just that area and it was gone. Accuracy returned. </p><p></p><p>I have a 257 weatherby chambering in a 3 groove Lilja that has 750 rounds through it. The throat and 8 inches past it are horribly cracked like a dried up clay pond. It looks like it should be replaced but with proper cleaning and lots of soaking with Bore Tech Eliminator it cleans up and still shoots under 1/2 MOA. If I didn't have a way to confirm the bore was clean I might have condemned this barrel and replaced it. </p><p></p><p>In addition to verifying the bore is clean you can inspect to see if there are any anomolies in the rifling, chambering or crown. </p><p></p><p> Without seeing you can only guess as to the condition of a barrel.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 744247, member: 5219"] It you could get to a borescope you could find out a great deal about your barrel. My friend got one and it was a real eyeopener. After viewing many barrels and learning what each barrel required to clean it, I bought my own. It takes the mystery out of what works and what doesn't. You can spot trouble areas that accumulate more fouling than the rest of the barrel. Example: I have a beautiful Bartlein 5R 1 in 7.5 twist 6mm-284. It was shooting very tight groups at 200 yds. One session the group size doubled. I cleaned it and it still shot poorly. My friend suggested we study the insides with his borescope. We discovered a dark residue clinging to the "corners" of the rifling 3-5" from the end of the 30" barrel. Some Iosso polishing done to just that area and it was gone. Accuracy returned. I have a 257 weatherby chambering in a 3 groove Lilja that has 750 rounds through it. The throat and 8 inches past it are horribly cracked like a dried up clay pond. It looks like it should be replaced but with proper cleaning and lots of soaking with Bore Tech Eliminator it cleans up and still shoots under 1/2 MOA. If I didn't have a way to confirm the bore was clean I might have condemned this barrel and replaced it. In addition to verifying the bore is clean you can inspect to see if there are any anomolies in the rifling, chambering or crown. Without seeing you can only guess as to the condition of a barrel. [/QUOTE]
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Determine if Barrel is "Shot" . . . ?
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