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I would like to have some input from you guys regarding long-term experience with stainless barrels.
I have made the observation on two Sako SS barrels that they seem to become rather brittle after about 2,000 rounds. I use a borescope to inspect my barrels. And what I see is that I get a fair amount of copper build-up on the first third of the barrel behind the receiver. It looks like the build-up is primarily forming in surface cavities. Even after cleaning with anti-copper solvents twice, I still see "fields of copper" all over the place. Never had this on carbon steel barrels this badly after a comparable amount of shots through them.
Do SS barrels erode faster than carbon steel barrels?
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Reply with quote #3
McFox: Another "no". You did not say what the cartridge is. If it's one of the "boomers", 2K could be normal fire-cracking. I have a factory chrome-moly 22-250 with 2235 rds. thru it, nearing the "end-of-life", and the fire-cracking holes also fill-up with copper, as seen with my "Hawkeye".
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I have this on a .222 and .308 barrel. Compared to Blaser carbon steel barrels they show clear signs of faster erosion.
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McFox: That's really a low round count, if accurate, for a 222 Rem and 308. I've seen similar indications of throat/barrel erosion with the "Hawkeye", but after a cleanup session with JB bore paste (blue label), the bore is the usual excellent surface. I've looked inside some of my barrels, and saw what I thought was the beginning of fire-cracking, and after a good cleanup, removing the accumulated carbon, the "firecracking" is gone. In these instances, I think it's the hard surface of the carbon that is "cracked", and underneath, the barrel steel is close to "as new". Give it a good cleaning with JB & 'scope it again, you may be surprised. Just some of what I've learned ( I think) with the borescope: best investment I ever made.
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I have not see much difference between SST and Steel. However, I think some of the chemical cleaners result in faster fire cracking.
If you have a crack and the liquid clean gets in the crack it is later exposed to several thousand degree heat. Who knows what happens.
I stopped using all chemical cleaners on my premium barrels. I use only Koil and bore paste.
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"I've stopped using chemical cleaners in my barrels. I only use Koil (sic) and JB."
I assume that you do not consider either of these products to be chemicals. What are they? If Kroil ain't a chemical then grits ain't groceries.
Reply with quote #8
"Chemical Cleaner" Koil is a penetrating oil. Bore Paste is very mild clay base abrasive.