Worry less about the bullet and more on YOUR accuracy. Practice with what you carry and be able to get 2-3 fast accurate shots. I don't think you would get a complaint from the bad guy no matter what you use.
If I remember correctly , the original load for the Colt Walker , or " Walker Colt " either is fine was 60 grs of FFFg , according to the internet . It was later reduced to 50 grs of FFFg . Regards Paul
For plinking plates and close range defensive work it should be fine . You mentioned " hunting " I would not use it for that unless you are talking about closer distance . I used to buy from Georgia-Arms and always liked what they sold . Regards Paul