Chad Adam Browne wrote:
I think you may be correct there, for electric strings you can get any gauge up to .76 from Ernie Ball and through Daddario you can get any gauge up to .80. I've had to personally badger the agents to get them to bring in gauges that high so it takes a bit of doing unfortunately, the other alternative is juststrings.com. I unfortunately have little to no experience with acoustic baritones, I have noticed that the players I listen to who use acoustic baritones seem to use .13 gauge sets but I'm not sure if this'll be what you are looking for.
I don't have a baritone, but I have a friend who does. He and I both play with 13s on our regular guitars, and he finds that 13s don't work that well on a baritone - though it may depend what tuning you use. He tunes down a 4th, and even with the longer scale neck the 13s are a bit undertensioned.