It should be legal as a standard rifle, but not a hunter.
As for ergos, TCs are narrow and light weight. It all depends on how you like to place your non trigger hand, but mostly they are hard to hold. Now, how to explain what makes a good offhand stock? Proper balance with enough weight to damp the muzzle end, but not so far forward to make the butt want to climb your shoulder. High comb and lots of drop at the butt, to allow you to keep your head erect. Fairly short LOP to keep everything close in to your body. Comfortable for the off hand, with as deep a belly as the rules allow to keep the off arm low. Grip that allows a natural placement of the trigger hand's wrist so you have the most possible control of your trigger finger. Others can probably elaborate better than I can, but that is what comes to mind at the moment.
Personally, I like the Fajen silhouette stock. Fred Wenig makes one as does Boyd's. You see lots of 10-22s with these stocks, and they seem to work for many people. When I put one of the Boyd ones on my Rem 700, my scores jumped right away. I completely reshaped the forend, but the butt is about the same. They are (for me at least) very easy to hold and control. Gunstocks Inc is making something like that for the Contender, called the Stinger.
Hope this is helpful, this fit business is such a personal thing that what works for one doesn't always work for another. But if you have a Contender already, there's no reason not to shoot silhouettes with it and have a good time!
