Illustration No. 1
Normal Drilling configuration with 2 shotgun barrels over a rimmed, centerfire rifle (most are 16 ga. x 16 ga. by either 9.3x72R or 8x57JR cal.).
Normal Drilling configuration with 2 shotgun barrels over a rimmed, centerfire rifle (most are 16 ga. x 16 ga. by either 9.3x72R or 8x57JR cal.).
Two rifle barrels over a shotgun. This configuration will normally command twice the price as No. 1. German designation is "Doppelbüchsdrilling".
Three barrels with no two being the same gauge or caliber. This configuration is very collectible, especially if the smallest caliber is .22 LR. Again, price will be double (or more) of No. 1.
Sometimes called a Bock Drilling with one shotgun and two rifle barrels of different calibers. This variation brings a good premium over No. 1.
Rib Drilling with rifle caliber generally small (.22 LR or .22 Hornet). German designation is "Schienendrilling".
Three shotgun barrels with the same gauge or three rifle barrels with different calibers. This configuration is quite rare and healthy premiums are charged over No. 1.
A variation of No. 3, this configuration features shotgun O/U barrels with a rifle barrel on the side. German designation is "Bock-Doppelflinte mit seitlichem Kleinkaliberlauf".
Very unusual - a 3-barrel Drilling in vertical design - two rifle barrels under a shotgun barrel. This configuration is seldom encountered.