Re: is 50## enough
I'm no expert, so my opinion is about all I can offer.
I'm not too familiar with the bow you mentioned, but I would suspect it would depend a lot on the setup you have. By this I mean, are you shooting carbon arrows or aluminum arrows and what type of broad heads are you shooting? Mechanical broadheads require more energy to open the blades. It may not be a huge amount, but it's note-worthy. We all know carbon arrows are faster too. What type of speed is the bow capable of? These are the type things to take into consideration.
My first bow was a Darton youth bow. Setting at 45lbs, I would not take a shot past 40 yards with it and that was still pushing it. If I turned it up to 50, I doubt it having the power to take a dear past 40yards still. I honestly don't think I could fit enough pins in the sight to get me out to 70yards.
My current bow is only on about 60lbs, but it's designed to shoot arrows fast. I know for a fact it will take deer at 70 yards if I do my part. (I don't like shooting past 40 though.)
So to answer your question. It probably will provided you can launch your arrows with enough speed to make them count, which most of your recent bows can do. I just feel better shooting more weight.