I roughly class drillings into two groups -- those that handle like well balanced doubles (longer barrels, generally 16 gauge and generally lower powered rifle barrel, no scope, about 6,5-7,0 lbs) and those that do not handle like well balanced doubles (shorter barrels, generally 12 gauge, more powerful rifle, claw or rail mounts for scope, usually 8,0+ lbs without scope). Both can be shot well on flying birds, assuming good shooter, decent stock dimensions, etc., etc.
I used a kombi for grouse etc. for many years. It had 16X67 shot barrel and 7X57R rifle barrel - 7,0 lbs empty, no scope. Sometimes it had 1X4 powered scope, sometime not. It was and remains one of the best balanced shotguns I own -- Killed far more grouse with it than with all my other shotguns together.
I never did find a nice 16X16X7X57R drilling, with claw mounts and 1X4 scope, that handled well as shotgun AND had a price tag I was willing to pay.
ANY drilling will take some getting used to, IF you wish to use it as a drilling, thanks to the mechanisms required for the rifle barrel. Generally much simpler to use as double, kombi or single shot rifle.
Niklas
