7.65
If a buddy handloads, it's just a matter of running a .30-06 case through a 7.65X53 die with de-capping rod removed. Trim to length, then re-size with decapping rod back in. Thats all there is to it.
Make sure to stick within load limits in book. Earlier model 1891's should be reduced a little more than '98 action rifles apparently.
Cheers
Geoff