I have been reading Norbert Klups’ excellent book, ‘The Drilling’ and I noticed that several people on this forum use drillings and combination guns. Whilst the idea of having a shotgun and rifle available sound very useful, particularly for pest control (e.g. crow, pigeon, fox, rabbit etc), I was unsure of the practicality. I can see the advantage of having a shotgun, a centrefire rifle and a rimfire or small calibre rifle in an insert (Einstecklaufe) in one firearm, but I wondered how practical this is for stalking, as I am aware of several stalkers and estates who will not allow single shot rifles for deer.
I also wondered how practical using the drilling loaded with two shotgun slugs and a single rifle cartridge is for driven boar? I have never used a drilling or shot boar, so I have no idea! I noticed that most modern drillings seems to be 20 bore (to keep weight down, I think) and presumably a 20 bore slug would be too small for boar? I think some countries insist on a minimum of 1oz slugs.
A solution may be to have a large calibre insert, converting the drilling to a double rifle with a shotgun barrel, so would a modern drilling, such as a Blaser D99 or a Zoli Drilling stand the pressure of a 7x65r insert, for instance? I noticed there is a premium if you have the D99 Duo with two large calibre barrels, so I thought it may need some modifications.
All this is obviously just theory but any thoughts would be welcome.