Reloading dies can be found reasonably at C&H4D and the owner seems very knowledgeable about the old ones. Be sure and slug the bore as it could be quite a bit smaller than .366 as 9.3x72R's will run as small as .358. Buffalo Arms has a 200gr two diameter bullet that works well in the smaller bores. I believe they should have brass for it also.

After the first shot the rest are just noise.