Pacnor 45 barrel suddenly got a couple rough spots.

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What does the other spot look like now? It for sure looks like a friction weld. From the blackspot to the actual deposit makes me wonder if some metal pieces/shavings/something got in there with your bullet. That seems too tough to just be the aluminum alloy from yer anti-seize.
 
If it was me, and i am not saying you should, i would get one of my long electrician screwdrivers and my borescope and try to carefully chip it loose, then polish the spot out if it still looks rough. But I've been a mechanic for 35 years. You maybe should send it to your favorite gunsmith. I would rather have a scratch in the barrel than that lump, after seeing what it did to that copper bullet.
 
Update – I dropped a .452 then a .451 pin gauge down the barrel until it hit the bump. A .450 won’t fit. The gauge has a small chamfer but I thought I would see what it would do without using much force. I then lightly taped it by the bump. It looked like it took some off or flattened it. See the picture. I am going to talk with a machinist/engineer/ gunsmith this weekend and get his thoughts. He might be able to make me something.


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I am now only working from the breech. Today I took a 250 Barnes MZ (that would just fit down the barrel with a light tap) and I cut a couple grooves in and then knurled it a little. I would tap it down the barrel until it hit the area of the blobs. I would then work it back and forth until it got loose. I then would clean the barrel and repeat. The borescope shows a little of the bump left but I can’t feel it when I clean with a patch. I also pushed a full-sized Bear Creek 245 copper bullet down the bore and I could not feel the bump. I think I will shoot some full sized bullets smokeless knurled (because it is cheaper). Then look at it with the borescope again. If it shoots ok, I think I will live with it. I think I could lap it but I could make it worse.

If anyone has any thoughts, I’m all ears.

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I am now only working from the breech. Today I took a 250 Barnes MZ (that would just fit down the barrel with a light tap) and I cut a couple grooves in and then knurled it a little. I would tap it down the barrel until it hit the area of the blobs. I would then work it back and forth until it got loose. I then would clean the barrel and repeat. The borescope shows a little of the bump left but I can’t feel it when I clean with a patch. I also pushed a full-sized Bear Creek 245 copper bullet down the bore and I could not feel the bump. I think I will shoot some full sized bullets smokeless knurled (because it is cheaper). Then look at it with the borescope again. If it shoots ok, I think I will live with it. I think I could lap it but I could make it worse.

If anyone has any thoughts, I’m all ears.

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I think at this point the lewis tool is the way to go . My goal would be nothing left there . I can see no good coming from leaving any little bit of it still there . The barrel can always be polished up so no rough spots anywhere afterwards . This is important for no future issues to reoccur . Once is enough !!! Just saw this today (monday) . My notifications are getting screwy !!!!
 
What you are doing seems to be working but/ maybe try a lead bullet knurled and roll it in silicone carbide valve grinding compound. I lapped a tight spot out of the bore of my Apex conversion this way. The silicon carbide will embed into the lead before it will actually score the barrel. It took me less than 5 minutes to lap the tight spot out. Just a suggestion to finish it out.
 
D55 - I thought about about trying something like that as I have the materials but was waiting to see if someone had experience as a guide.
 
I drilled a lead bullet and screwed in a ml ball/bullet puller screw with ramrod. Eventually you will work this thing out. You may have to knurl the bullet and embed with compound a few times but I think you will accomplish a complete removal. I shoot barnes bullets not annealed but knurled with under moa accuracy.
 
I worked on getting the bump out for about half a day last week. Knurled some bullets and the bras jag and kept going over the bad spots. I also used some bore paste and mild abrasive. I have attached the last picture. I can’t feel the bump anymore but the scope shows its there. I think I will shoot it sabotless with some knurled bullets and then try it with a 240 fury and harvester blue sabot. I will post results when I get a chance to shoot. I think I could work another day on it and still might not be gone, and I may end up doing more.


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I talked with him at the Hunting show in Grand Rapids but he didn't look at it. Like everyone else he didn't have a good explanation either.
 
Update/Final??- shot it yesterday. I shot it 3 knurled 250MZ Barnes smokeless. The I shot 100gr weighed BH209 with 240 Fury and 245 Bear Creek Ballistics. The target tells the story, it shot great. The picture shows the bump is still there but it is hard to feel. I will probably leave it as is for now. I don’t want to screw anything up but I may try to get the rest out if I have some time to kill. Thanks for all the help.

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I would see if someone can push a new rifling button down the barrel. Hard to tell by the pics, but I’m assuming it’s in a groove. Looks like it’s shooting ok though. It would always just be in the back of my mind that something is stuck in my barrel.
 
Personally i believe that deposit is the result of that particular anti-seize . Its use in an enviroment with the presence of an oxidizer is Exactly just 1 of the conditions that its Manufacturer clearly warns of . That product is mis--applied for the job at hand IMO . Once again just sayin.......
 

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