Besides the online sources that Alpo listed, also check the Hodgdon's Powder Online Manual.
In the manuals that I've got on hand...Hornady, Sierra, and Lyman all have data for the 7.65x53. It's roughly equivalent to the .303Brit in velocity and power (and like mild .308 loads like JLA posted).
Also heed warriflefans's warning about not loading too heavy for a '91 Mauser.
A pierced primer in a '91 action will vent the gas straight back through the bolt and you'll get peppered in the face. I always stuck with loads at least 100fps below the listed maximuns just for an extra safety margin.
If the rifle has a good clean bore and still groups accurately, it'll make a fine deer rifle.
I had better luck with 174gr RN bullets rather than 150gr SPs in the couple '91s that I've had in the past...the '91 has a 1-10" twist and a fairly long leade (distance from the case mouth to the beginning of the rifling).
I've still got an '09 Argentine that shoots better with 150gr...but as rough and pitted as the bore is I'm surprised it groups at all. I had always intended to use it for a rebarrel project but haven't got to that yet.