Personally I would never use Tubbs unless the rifle shot very badly and I had tried every thing else possible. I would think real hard about trading it off before doing that or getting a new barrel. Tubbs Final Finish has a tendency of eroding the throat. It sounds like to me that it needed more cleaning and then some shooting to foul it back up. Once a barrel is badly fouled up with copper, it takes a lot of cleaning to get it really clean. I go through several sessions with a foaming cleaner to clean mine. If it is really bad I first put some TM solution through it and let it soak for several hours and the use a nylon brush and scrub the heck out of it adding more TM every so often. I then run in a bunch of clean , tight fitting patches. Then run in the foam, letting it set for a while before patching it out and reapplying until clean. I do my cleaning indoors, so I like to avoid the ammonia type cleaners, but they work very well too. It sounds like you buy your ammo, not reload. Has the brand you are using changed over the years? You may have to try another bullet weight or another brand to get your accuracy back too. When I have a gun that shoots satisfactorily and the accuracy starts to drop off, the first thing I think about is a barrel scrubbing. If all else fails, you can buy an after market barrel and install it your self as and alternate to trading it off. Good Luck and Good shooting.
