That's what I found.
If your bore is a true .356 then you can get good .356 jacketed bullets from Hawk bullets:
http://www.hawkbullets.com/Or .357 lead from a number of sources incl Beartooth. Lead is the safest and most effective way to go with these old beasts...IMHO.
Personally, I wouldn't shoot .358 jacketed bullets in my 93 Mauser, but I know some folks do. A lot depends on the condition off your rifle, but running larger bullets than the bore will increase pressures. IF you have a 98 Mauser, then that's less of a concern.
Remember, the 98 has excellent gas handling safeguards for a case separation or pierced primer...the 93's and 95's are not as good. So ask yourself how many fps gain is your eyesight worth?
