It would be hard to not go with Jack O'connor's combo of H4831 and a 130 gr. bullet. His loads were a little heavier than most published today; modern H4831 may be a little faster than the surplus powder he was using. Fiftynine grs. of current H4831 is probably close to perfect.
I think JOC may have gone as high as 62 gr. with 130's. Agree that the slightly faster, newer H-4831 may be equivalent at around 59 gr.
I have some vintage H-4831 that I got back in the '60's. It came in paper bags in a divided cardboard box. The paper became brittle and I transferred the powder into empty plastic powder bottles, labeled them with a Sharpie. Powder still smells good, no brown dust and it still shoots good. I do keep it in a climate controlled shop.
I've used 60 gr., never pushed it to Jack's max.
DF
