I used the Shoot Out in a couple of my bores. It works best with the tightest ball/patch combo you can get down the bore. I was having a heck of a time getting the surface rust out of my .50 Pedersoli Frontier's bore. But after 30 shots with 35 gr of FFg and a .495 ball with a .020" patch the bore is like new. It was a real challenge getting that ball down the bore but it was worth it in the end.
Now I am starting to test Frontier's Anti-rust patch lube and so far it looks promising. I still need a bit more shooting to validate. And I'm still waiting for my .54 flintlock barrel to come in from betting blued. I stopped by today and he said he was going to blue on Friday or Saturday. I told him I will be down on Monday and I'll be bringing a club to beat him with if it ain't done!