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If the barrel is truly that bad, and it sounds like it is, I'd go to the Sinclair website and get a set of Tubb's lapping bullets. fire a course of these bullets and you will have done all you can do to help a rough barrel.
I have a 22lr finishing off handgun that would foul something awful. I got one of those lapping kits, with different abrasives, I must admit that I did a very crude job of it, but the barrel is now a thing of true beauty with little fouling troubles. After doing the paste lapping thing, I would deffinately go with the bullets with the lapping compound already on the bullets.
Paste lapping does work.
I've tested 6 Ruger 10-22 factory barrels before and after doing 100 strokes with a JB loaded patch. In each case, the barrel shot better afterwards.
I've also done several centerfire as well as other 22RF barrels and every one shoots well after doing the paste job.
Don
