Just bought a 2 wt. Cabelas CGT (fiberglass, advertised medium action, probably leaning a little toward medium-fast in reality), 6 foot. Its a beautiful thing to lay #22's down as a gentle as a breeze with it; but throwing #6 beadheads under a strike indicator is tough (as I did kind of expect); impossible with a roll cast. I've read some about overlining, that it can help significantly with roll-casting in general, and I'm also thinking that heavier line could carry the heavier flies better. My main concern is whether the rod will be able to move the heavier line. I wouldn't be too worried about 3 wt. line, but i'm not sure that's enough of a difference from 2 wt to make a difference. Is going with 4wt going to be too much for a medium/medium-fast action, mere 6' 2wt to handle? Any advice would be much appreciated.