The last question on Sherpings seemed to draw quite a few knowledgable responses. I have a very nice H. Sherping drilling. Its a back action lock, underlever gun in 12X12X?
A gunsmith years ago said it was a 9.3 X 72 but all he did was take my money. The markings on the barrels are few. The only one that seems to pertain to caliber is 8.7mm. On my Kobalt digital calipers (second set and as junky as the first set I returned)the bore reads between 355 and 358, depending which time you measure it.

I always thought Sherping built this gun. It seems it may have come from a number of makers and was finished at Sherpings from the replies to the other question on these guns. Any way to tell the maker? Quality-wise, this is probably the finest gun I've ever owned and have kept it for over 30 years while others have come and gone.