You ought to check out some of the target shooters somewhere. 50# or a little less was and still may be the norm for shooting Field archery---out to 80 yards.
How about FITA? Not many of these shooters drawing much more than 40# with recurves to shoot way out at 90 meters (100 yards).
So I'd venture a guess and say a 50# compound would be quite capable of good accuracy out at 40-50 yards. Wouldn't you? Poundage has nothing to do with accuracy, unless it's too much poundage---more than the shooter can handle, which is more often the case than too little.
FYI, I have a 26.5" draw and shoot about 45# and can shoot sub 2" groups at 40 yards on good days; 3 1/2" on average days. Just proving it's not how much weight you shoot. It's how accurately you shoot what you have. And for that it's all about shooting form.