I have both the 30/30 Win and 30/30 AI both being 14". I like the extra length for velocity and also a touch more weight for recoil. Both shoot well out to 200 yards. That's a long shot if you are not too use to handgun hunting. My longest known shot being 216 yards with a Contender with a 14" 445 Super Mag.
I use a front load hunting vest that I stick the Contender/Encore into so up to 15" is comfortable.
At 5'7" I'm thinking that your hand is not all that big neither. With that said I'm 5'8" and really like the Contender grip size much better. Yes, I have both the Encore and Contender setup for handgun hunting. I'm a little backwards when it comes to the Encore. Instead of muzzle blasting rifle rounds in short barrels mine are 454 Casull,460 S&W,500 S&W,500 Linebaugh,480 Ruger,444 Marlin,475 Linebaugh.
In the Contender I have 13 times more Handgun barrels which I love to hunt everything with. SO, as you can see no matter which one you get I bet you get more than just the 30/30 AI barrel and love each one!!! Also, suggest using electronic ear muffs when shooting/hunting. You have been warned!