I have two 9.3 guns, one a cape gun and the other a stalking rifle. You can get bullets from Buffalo Bullets, Hawk Bullets and Huntington with no problem. The Buffalo bullets seem to match the current 193 gr copper jacketed ones, Hawk sells a 200 grain soft copper jacketed one my cape gun loves. Huntingtons sells a 200 grain lead bullet that is very good. Steve Meyer I think has posted the most important fact. Your gun is on the small side as far as bore goes. Slug the barrel as well as chamber cast. I failed to slug the bore on my stalking rifle and was putting .366 bullets down a .348 bore. Accuracy was not good and I almost lost some teeth from recoil. Huntingtons sells .348 bullets that should work well. They also sell brass as does Buffalo bullets. S&B sells loaded ammo but it is expensive and is really for the .365/.366 bore guns. I'm a member of the GGCA and had Steve's article. It was excellent but I should have read it before I fired. This is a nice cartridge for deer out to about 100-150l yard, low recoil and can be very accurate.
Frank