I'm about 160 and I shoot a 60 pounder, I have no trouble with the bow, drawing, anchoring, holding steady etc - but about two hours constant is the max I can shoot before my form starts to suffer.
I've only been at this about 6 months though, so for you guys who have been doing it for years, does it ever become effortless?
Oh and before anyone tells me to go lighter I just ordered a longbow which I'm planning to get made at about 43 @ 28 (which I guess will be about 48-49 at my draw) but the minimum hunting weight in my state is 50 anyway and I shoot 650gr arrows and I like being able to sling them fast out of my heavier one... plus I really like shooting that weight, it just feels nice