Our club does "Full Bore" gallery shooting once a month using both 38/357s and 44 Underlevers (Iron Sights Only - No scopes allowed for "Full Bore" competition shooting in our club).
One of our members (Who is with GMP) does have his 38/357 "conditioned" for Fox but I don't know if it is also conditioned for Deer.
I have shot most of our "Club Guns" (Most of which have been "Worked On" in various ways - Trigger, Action, etc) and some of the members guns as well so have a "limited experience" with Rossi, Marlin, Winchester and the likes. Personally I prefer the Marlin or the Rossi, but for no other reason than the fact that they have a "nicer feel" to them, and as such if I were going to buy my own (No plans for that in the near future) then they are the two that I would chose from.
I find shooting these "Underlevers" one of the most enjoyable ways to shoot targets but even though I am a reasonable shot with them (I've just won our club's annual trophy for the highest averages through the season with these underlevers) I'm not too sure that I would want to take on a Deer with one - But then again, everyone to their own!