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Have a look at my post on page 1 it tells you how, if you cant get a lead slug the right size freebore measurement may do the trick as its easier to do with a lever action. It will tell you how badly...

Have a look at my post on page 1 it tells you how, if you cant get a lead slug the right size freebore measurement may do the trick as its easier to do with a lever action. It will tell you how badly...

Phosphoric might work but the inside of the barrel will be parkerised and that isnt shiny.
Sell it to a pig hunter, the accuracies way better than what they usually require so it could be marketed...

Ha ha, change the sights, I couldnt hit a flock of barns at 40 yards with mine, got a lyman 66 and it now does 2moa. Not saying thats true for your one but may be worth considering.

Fire lapping is shooting either a plug of valve grinding compound or a lead slug rolled in the stuff. Its great for removing stuff and getting a shiny bore but does not a lot for barrel life and wont...

A few questions
Are the holes in the target round or slightly oval?
Have you slugged the barrel (run a lead plug through it) and measrured it and measured freebore ( push a projectile in from the...

Copper is unlikely to be a problem, Huk has outlined the main cause of "shoots like shit" issues. Pitting from rust especially at the muzzle could be it.
It may help to show a target, or describe...