My daughter bought me a new toy for CHRISTmas, a Teslong borescope. I absolutely love it. but, now i have something that i do not quite understand. on my Remington 700, 300 win mag, there is some copper deposits, which I figure is normal. but, the last 6-8" of the barrel, all the way around, the copper is MUCH HEAVIER. to me, that equates to a barrel that is smaller in the I.D. at the end of the barrel. Is that so? and what can I do about it? how can I do an actual measurement, and one past what appears as the tight spot.
new toy, questionable results???
- Thread starter x_wrench
- Start date
Big Bore 44
Member
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- Sep 2, 2019
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- 135
Slug the bore at several spots working from the breech end. Drive the lubed Lead slug part way in then back out the same end.
Blue68f100
Member
It can be removed if you actually needs too. Use some good copper solvent like Sweet's. Once removed you may want to try bore lapping the barrel to smooth out the roughness were it accoured. And it may require you to foul the barrel to get it so it shoots good again. My rule if it's shooting good I don't mess with it.
Kp321
Member
Possibly there is some roughness in that area that starts the fouling. Look at it again after a thorough cleaning and see if anything is obvious. If it shoots well, don’t worry. Bore scopes are good tools but bring up a lot of questions.
Seedy Character
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- Sep 6, 2021
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- 2,064
^^^^^^^ THIS
Clean the copper fouling and be happy.
It appears you were happy BEFORE the bore scope.
For ME, the bore is for gun shows. Shot out barrels, pitted, and working the deal.
the groups had opened up the last couple of times I had shot it. this was a sub moa barrel so I figured i should take a look since i now have a way to look and see. I KNOW that many of the small imperfections inside of a barrel mean nothing for a production gun. as proof the sub moa speaks for itself. it just seems really odd that 90% of the copper ends up in the last 15% or so of the barrel. I use Hoppes "Bench Rest Copper Solvent" to clean with. I sent a email to Hoppes to see how old a bottle of this solvent has to be before it looses its copper removing ability. it might be that simple. old solvent.
jdsingleshot
Member
No, most rifle bores do not taper in either direction. Cut rifling and button rifling would be impossible.
