I don't have the Hunter barrel with it's faster twist. But do have a .50 and a .54 Great Plains with the 1:60 twist ball barrels. I would not part with them. Great guns, and accurate. Frankly, I'd recommend the .54 ball shooter. Get a cheap Lee ball mold, cast your own balls for pennies, and have a fine deer killer too.
Were I to get a 1:32 twist, I'd go with the .50 caliber rather than the .54.