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Post by kennacl55 on Jan 19, 2020 21:09:57 GMT -5
I looked at your original post about the bullets you were shooting and remembered finding some barnes bullets that were left on one of the shooting benches at the range I shoot at. They had been annealed and looked terrible. They looked like they had a rough scale on them. I don't know if they could have been to hot when annealed or not. Just trying to help here as I have never annealed bullets before.
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Post by edge on Jan 20, 2020 9:50:41 GMT -5
Looking at the pictures, I suggest a slightly harder material.
You are deforming BOTH the deposit, and your tooling, which makes me believe they are too close in hardness to make much headway. Obviously you want nothing close to the hardness of the barrel, but a fair amount harder than the deposit.
Some aluminum alloys, some bronze alloys, depending on their heat treatment would probably fit the bill. Perhaps even a leaded steel, like a 12l14 might be acceptable ( with care ).
edge.
PS In looking at the pictures, am I correct in that the deposit is in the groove, and not the land? If that is the case, then to shear it off you really will probably need something that can reach the bottom of that groove. Probably it will take some work with a file. I don't know the actual contour of your rifling, but suspect the groove is about 0.100 wide and 0.004 deep.
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Post by dannoboone on Jan 20, 2020 12:41:54 GMT -5
I looked at your original post about the bullets you were shooting and remembered finding some barnes bullets that were left on one of the shooting benches at the range I shoot at. They had been annealed and looked terrible. They looked like they had a rough scale on them. I don't know if they could have been to hot when annealed or not. Just trying to help here as I have never annealed bullets before. This may be getting a little off topic, but perhaps not. After annealing Barnes bullets and noticing that rough scale, it worried me to push them through the die as well as down the barrel. I cleaned them in my rotary tumbler using the same cleaning solution and SS pins as one would with brass. They came out cleaner and shinier than when I took them out of the box.
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Post by ET on Jan 20, 2020 16:37:20 GMT -5
I've kind of shied away from this one in hope others with more experience could help find a solution. Whatever this foreign obstruction is it developed a molecular bond with the barrel steel. Only two methods I know of that might break that bond, chemical and heat. When you mentioned Loctite my first thought went to possibly trying Acetone and see if it had any effect. Second trying limited heat say under 300F that hopefully will break or reduce the bond. Otherwise I don't have any other suggestions.
Ed
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Post by bowbender6 on Jan 21, 2020 9:20:08 GMT -5
I tried acetone, it did nothing as for as I can tell.
Edge, I believe it is on the lands, there might be some in the groves, but not nearly as much. I have a set of pictures gauges and I thought about using one of those that fits, maybe .451. I would go slow. I might have to sharpen the edges as they have a tiny chamfer on them I think.
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Post by jims on Jan 21, 2020 11:43:45 GMT -5
If you can get it out, hopefully you will be able to determine what it is. Quite curious on that.
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Post by bowbender6 on Jan 27, 2020 14:37:45 GMT -5
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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Post by edge on Jan 27, 2020 15:20:32 GMT -5
That is beginning to look a lot like a defect in the barrel material itself, perhaps an inclusion or something.
I suppose a high velocity gas jetting past a momentarily stationery bullet/sabot could have done it. I would like to get a look under that scab.
edge.
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Post by bowbender6 on Jan 27, 2020 16:44:48 GMT -5
Edge- I don't think it has to do with the barrel material. It seem like it is soft. When I push something down the barrel and it hits it, I can tap on the rod lightly with a hammer and its seems to remove some of the material.
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Post by edge on Jan 28, 2020 8:39:49 GMT -5
Admittedly I can't really tell, but it appears there is a void under that scab.
In your most recent picture, the left side on the bottom looks like a void with a very rough surface. The whole "scab" almost looks like it is covering a void, and as you machine it, it pushes into the void and springs back.
I could be full of Adam Schiff too, can't wait to find out what the result ends up to be.
edge.
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Post by bowbender6 on Feb 11, 2020 13:26:23 GMT -5
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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Post by jims on Feb 11, 2020 20:46:18 GMT -5
Happy that no damage to the bore and it is shooting well again. If you ever determine what it is let us all know.
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Post by hemicuda on Feb 13, 2020 0:11:49 GMT -5
It looks like it may be a defect in the barrel steel, the more I look at it. We would find that on occasion when machining in the toolroom.
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Post by tasaman on Mar 4, 2020 7:22:18 GMT -5
You know when you have shot this barrel out what you need to do right. We want forensic analysis. Cut her open to reveal the truth. Till then, happy shooting.
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Post by huntereasttn on Aug 28, 2020 18:40:21 GMT -5
I know that I’m late to the game on this, but have you tried a good penetrating oil like Kroil? It might help to get below it and “lift” it
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Post by bowbender6 on Sept 11, 2020 20:43:06 GMT -5
Yes, on the Kroil, no luck
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