grand veneur
AH elite
I'm not sure anyone ever gets "comfortable" shooting big bore rifles. We just learn to put up with getting the shit kicked out of us.
It depends on what you mean by feeling "comfortable". It's normal that you have to concentrate more on the shot than with a smaller caliber rifle, but you should not be too tense when pulling the trigger. This has negative consequences on the accuracy of the shot. This is particularly important when practicing on the shooting range, especially when you shoot with the rifle on a bench. Things look then different in the field by hunting when you no longer concentrate on some of the side effects by shooting big bores. Shooting big bores remains hard work, that is right, although there are some differences whether you shoot with a rifle caliber 416 or with one caliber 458 and above, but imho with sufficient practice you can handle a rifle caliber 416 Rigby so well that you ultimately feel almost "comfortable" with it.