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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Teach me to lap barrels (PLEASE)!
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<blockquote data-quote="Buano" data-source="post: 739645" data-attributes="member: 21641"><p><span style="font-size: 12px">Back when I was an aerospace engineer I had access to borescopes. When I worked at Amsco Scientific we worked with them regularly. Sure I would like to have one now, but I can't hardly justify the cost of a borescope to work on ONE used rifle.</span></p><p><span style="font-size: 12px"></span></p><p><span style="font-size: 12px">The rifle has a stainless barrel and has been fired VERY little. When I got it the first 2 shots fired OK, then I had over pressure signs with factory ammunition. After stripping all copper from the barrel I was able to get 3 shots off without any over-pressure signs, but #4 was definitely over-pressure. Stripping the copper from the barrel again got me 3 shots before the pressure spiked. With a tight patch I could definitely feel the roughness in the center of the barrel, starting about 4" from the chamber and ending about 6" from the muzzle.</span></p><p><span style="font-size: 12px"></span></p><p><span style="font-size: 12px">I was investigating fire-lapping the barrel but it was explained to me that this was not as good as hand-laping. Looking through reviews of fire-lapping bullets I saw good results with barrels that didn't need a lot of work but less improvement in barrels that needed a lot of work. This barrel obviously needs a lot of work so I was looking at hand-lapping.</span></p><p><span style="font-size: 12px"></span></p><p><span style="font-size: 12px">I presumed I would not lap the last inch or two of the barrel so I could avoid possible damage to the muzzle. I also have no intention of going crazy lapping the barrel — I want to do just enough that bullets, or possibly fire-lapping, could do the rest.</span></p><p><span style="font-size: 12px"></span></p><p><span style="font-size: 12px">I also intend to replace this barrel with a longer one at some point in the future although I didn't plan on doing that immediately. I accept I bought a gun that was "less" than I expected and, under the circumstances, I paid too much. I got burnt — the question now is how to mitigate the damage. Do I fire-lap it? hand-lap it? or simply order a new barrel? (There is one other option, ship it to the factory & tell them to figure out why this happened.)</span></p><p><span style="font-size: 12px"></span></p><p><span style="font-size: 12px">I also looked into having the bore electro-polished but saw where rough barrels are generally lapped prior to electro-polishing. I presume this barrel would need to be lapped prior to electro-polishing.</span></p><p><span style="font-size: 12px"></span></p><p><span style="font-size: 12px">My post here was to understand hand-lapping barrels so I could decide if this was the way to go. I still lean towards hand-lapping, but people have given me pause to think about whether this is the right choice. The more people have said, the less I am sure this is the right way to go.</span></p></blockquote><p></p>
[QUOTE="Buano, post: 739645, member: 21641"] [SIZE="3"]Back when I was an aerospace engineer I had access to borescopes. When I worked at Amsco Scientific we worked with them regularly. Sure I would like to have one now, but I can't hardly justify the cost of a borescope to work on ONE used rifle. The rifle has a stainless barrel and has been fired VERY little. When I got it the first 2 shots fired OK, then I had over pressure signs with factory ammunition. After stripping all copper from the barrel I was able to get 3 shots off without any over-pressure signs, but #4 was definitely over-pressure. Stripping the copper from the barrel again got me 3 shots before the pressure spiked. With a tight patch I could definitely feel the roughness in the center of the barrel, starting about 4" from the chamber and ending about 6" from the muzzle. I was investigating fire-lapping the barrel but it was explained to me that this was not as good as hand-laping. Looking through reviews of fire-lapping bullets I saw good results with barrels that didn't need a lot of work but less improvement in barrels that needed a lot of work. This barrel obviously needs a lot of work so I was looking at hand-lapping. I presumed I would not lap the last inch or two of the barrel so I could avoid possible damage to the muzzle. I also have no intention of going crazy lapping the barrel — I want to do just enough that bullets, or possibly fire-lapping, could do the rest. I also intend to replace this barrel with a longer one at some point in the future although I didn't plan on doing that immediately. I accept I bought a gun that was "less" than I expected and, under the circumstances, I paid too much. I got burnt — the question now is how to mitigate the damage. Do I fire-lap it? hand-lap it? or simply order a new barrel? (There is one other option, ship it to the factory & tell them to figure out why this happened.) I also looked into having the bore electro-polished but saw where rough barrels are generally lapped prior to electro-polishing. I presume this barrel would need to be lapped prior to electro-polishing. My post here was to understand hand-lapping barrels so I could decide if this was the way to go. I still lean towards hand-lapping, but people have given me pause to think about whether this is the right choice. The more people have said, the less I am sure this is the right way to go.[/SIZE] [/QUOTE]
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Teach me to lap barrels (PLEASE)!
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