The Calcutta is a bulletproof reel by all means. But 40 -60 lb tuna you are pushing it, unless you want to spend an hour or so landing it. If you are on a private boat or a six pack they might let you get away with it. On a open charter they will cut your line (Other anglers get irritated as you are cutting into their paid charter time). If you are targeting 40-60lb tuna here are my suggestions from least expensive to most, and this is just an opinion.
Penn Senator 113
Shimano TLD 20/40
Avet 2 speed.
And I am no expert, I would hope Ken would pipe in here an give an opinion also.
That post was from me thanx..........you probably seen my other "idiot" post in the other chat room about catching a 20 pound tuna on a flippin stick..........it was just a joke.........as for the Calcutta 400, I have caught fish in the 20 pound class, and some large yellowtail, and it was at it's limits doing that so I figured anything larger would just glaze the drag, maybe the 700, but I don't know.............I need a reel though, my "old" Daiwa ocean master 2 speed is on life support..............
No problem Franklin, the 700 might cut it. I would still go with at least a 3/0 reel or larger. This is mostly a bass site, if you want to join in on saltwater discussions head over to AZOD, there is a saltwater forum there, pretty good group.