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I agree with rapier on giving the gun a good cleaning. However, I'd just first give it a scrubbing with whatever solvent you have on hand, then go to work with some JB Bore Paste. Put some on a tight patch and scrub with 25 strokes. Change patches and do it again. Twenty-five strokes. Go through this until the gun has had 100 stroke with four different patches. Then clean the JB residue from the bore with your solvent and dry with a couple of patches. using a good light, I use a pen light, inspect trhe condition of the bore at the muzzle. Most of the copper fouling should be gone and the minor amount left shouldn't be a problem.
I would also suspect the scope. I have a Winchester M70 Featherweight that fouls badly and I have to use the JB paste after every range session. However, accuracy was lousy. I had a trigger job done and the gun professionly glass bedded to no avail. I was ready to take a heavy hammer and smash that gun to pieces. On a hunch, I changes scopes as a last resort to taking it to a gun show and getting rid of it. The first group was under an inch and subsequent groups have ranged from .375" to one inch with the exception of one load using Winchester 150 gr. Power Point bulk bullets. FWIW, they do not shoot well in any .284" bore rifle I own. After the cleaning, if you have another scope handy, even if you have to spend $29.95 for a Wallyworld el cheapo just to check things out, do try another scope.
Paul B.
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