I've tried 'em all
My 357XP came with a 20 inch, 3/8, 058 bar. It was OK, but not impressive for sure. Swapped it for 16 inch 3/8 .058 set up. Really ripped very nicely with that combo. After I got the 346XP the 16 inch 3/8 bar went on it and the 357XP got an 18 inch 3/8 058 bar that is currently on there. Balances very well and the saw has the guts to pull a good chip when the bar is completely buried.
Can you mount a 24 inch bar on a 357XP? Sure, but it's going to be a real dog and not perform anywhere near what you're used to nor as Husky intended it to run. Besides that a 24 inch small mount Husky bar is not a common thing and they cost between $75 and $80 around here. Also the longer bars put more torque and stress on the clutch and bottom end of the saw. OK for occasional use and work in soft wood, but for 24 inch bars are the realm of the 70+ cc saws
I think the largest bar i would put on it would be an 18, it is plenty for my needs, but it's also nice to know that i could go to 20 if i needed it.
Thanks for the info, much appreciated.