50# is finr for most large game,
For deer no problem, if your going for moose/elk will want some more.
Not that 50# can't take a elk, just don't want to be borderline,
Also, depending how old your bow is, modern bows with high let offs are a lot easier to draw/hold than your older bow, a modern 60-70# bow may feel like a 50-60 bow of 10 yrs ago