RE: When is it clean?
I have nine center fire rifles most are only 10-20 years old but two are very old a 1903A1 and a late 20's model 14. Calibers are 224/277/308/358 makes are Remington, Ruger, Marlin, Springfield and Shilen match grade barrels on two. I don't have any ultra velocity guns either.
Like I said I never have had any copper folwing issues ever. Call this limited but I do not nor does any one I know that doesn't shoot pure copper jacketed bullets. So are you OK with that?
So If you do not have a problem why use something like sweets? The poster didn't say he had a bad copper problem so I gave him a simple answer to a simple question.And yes you can spend far to much time cleaning a gun that doesn't really require it.