One barrel will shoot very much like the next. The only way you see a difference is things like how hard they are to clean when you get a barrel break. Freaks are a pain because there are so many places for paint to get trapped, so you can't really carry on shooting until you've stopped to swab the barrel. The Race barrel kit (actually a Sanchez Machine SM-1) is the best multibore barrel I've used for that alone - if you get a break, you can shoot through it and be shooting at least roughly straight within 4 or 5 shots.
Or just use a big-bore one-piece barrel
Or just use a big-bore one-piece barrel