Something to consider depending on the age of the Drilling in question is how it is chambered. The older ones were chambered for 16ga 2-1/2" shells; modern is 2-3/4". Of course, you may be able to have a qualified gunsmith ream out the chamber, but obviously that has to be accomplished prior to the hunting trip.
Again, depending on the vintage, you should determine (pre-purchase) whether it is chambered for 8x57 JR or 8x57 JRS. Essentially the same rimmed cartridge case, but the former is bored for a 0.318" bullet whereas the latter is bored 0.323" -- a not insignificant difference. The "8mm Mauser" is a rimless cartridge, using a 0.323" bullet.
The 0.318" bullets seem to be much more difficult to locate compared to the much more common 0.323" version. Just something to consider if you intend to reload.
That may be a better option, as I suspect that both factory ammunition and components may be easier to obtain.