The load that I use is 6gr of Unique with a #8005 85gr round nose bullet by Sierra. It is not a very hot load but we are talking about a 70+ year old gun.
If you have not done so, get a new bolt stop. You can keep the old one but use a new one. Tom Heller on this forum has them. They can crystalize and break. Since that is the only thing keeping the bolt from coming out the back of the pistol, a trip to the morgue or at least the hospital could result.
Check out this web site for information on these Mausers:
http://www.northwest-denture.com/mauser1896/
They have a large reloading chart as well as other information.
Steve