Not a fan of any currently mass-produced small bores. I have an old Thompson Center Seneca which is quite a fine rifle but these are a bit scarce lately.
As to caliber, I have seen several good shooters with .36 cal, but only one with a .32 and he struggled with that one for a while before becoming consistent. I have a .40, but understand that some people and agencies see it as too large. Fortunately, in Mississippi, it is legal for small game.
I know that you say that you want a production gun. That is a difficult concept because there are varying degrees of production. You would understand if you visited Tip Curtis' shop while in action. Seriously, after handling his half stock southern mountain rifle, I would look up Tip Curtis and buy one off of his rack in .36 caliber.
Tip Curtis Frontier Shop
Custom Guns
Parts and Supplies for Kentucky Rifles
P.O. Box 203
4445 Jernigan Road
Cross Plains, TN 37049
Bus: 615-654-4445
Fax: 615-654-4446
CS