Contenders do accumulate barrels. A 10" .357 would be great for your existing line up, and can be loaded really nice for deer in a 10" barrel with slower burning powders.
It seems like when I reach for a 22lr, its rarely my contender barrel. So if youre like me, don't know if I could recommend that one. So hard to call that.
I do have to recommend a 45/410. I love my 410 barrel. Plus you can lob your 45colts out of it.
You already have the 30-30 which is one of my favorites in the contender.
Good luck in an area with no bad choices!
(I never could shoot Blackhawks worth a crap either)