Drillings have their place here in New England where the cover is often quite thick as they are often short barreled and fairly light and fast handling. You can also have near instant selection of shot, buckshot, slug, or rifle.
In Africa, when bird shooting, having a rifle round at the ready gives a bit more comfort to your prowl through the jesse. a few Brenneke slugs in your pocket help as well. The rifle, depending on caliber, can be used for anything up to the big ones.
One is usualy limited to two rifles when traveling so My African battery is my heavy [500/450 nitro] double, and a scoped drilling. The rifle barrel is capable of 1 1/2 inch groups at 100 yards.
All the best, Mal