I had a MAX in a 10" Contender years ago..It was a factory TC barrel and had that weird SAAMI chamber in it with a forcing cone...It never shot worth a hoot! Got rid of it and got a .357 Herrett that with the right powders shot like a house afire! Near 1" 3 shot groups at 100 yards! I could safely get about 1850 fps with 158 grain JHP in the Max and about 100 fps more in the Herrett with same bullet. I like the idea of the MAX and no case forming..Having had both...If you can get Bellium to make you a barrel with a NORMAL chamber for the MAX it would be the way to go...Killed my biggest buck ever and my longest shot buck ever with the Herrett..the MAX will do just as well.
I went with the 13" for my Contender barrel. I hunt mostly from a tree stand. Stalking shorter might work out. When ordering your MGM barrel send in a Dummy Round with the bullet you are planning to use seated to the depth you are planning on seating them. I sent in both a Long Seated 358-180 NOE Cast, and a Long Seated 180 XTP load. My barrel handles both very well. Another bullet you might look at is the 158 FP/XTP #35780. It might be an even better choice with a shorter barrel.
If you are looking at a 357 Maximum, I am guessing that you know Starline is making brass for it. I am happy Starline took care of that void in brass availability.