I do not think the aim is to get comfortable with a .40 cal +, rather think of being able to shoot the .40 cl+ accurately under any circumstance in stressful dangerous game hunt scenarios...any hunter can get comfortable with a .40 cal+ rifle if he use it frequently..the challenge being hunting dangerous game close up with it.
During the golden age of the Kruger National Park in South Africa , in the 1980 era, prospective game rangers has to complete three shooting exercises.. the first one being able to handle and shoot heavy caliber rifles, from a . 375 H&H Magnum upwards to a .458 Win Mag as issued by Parks Board.
The second phase was about shooting at life size targets of dangerous game animals from different angles and positions that was placed in the veld.
The third and last test was done where a helicopter would drive a bull elephant towards the prospective ranger and an old hand /veteran ranger who would act as the backup. The prospective ranger was only allowed to shoot his first shot when the enraged elephant bull was twenty meters from him..
If he is unable to do this he then is place in a administrative post or re-assigned at another game reserve.
Only the best game rangers was used then to take visitors on a game trail for a week.
Here is a book available from Cleve Cheney about his years he spend in the Kruger National Park in the Golden era ....contact details:
cscheney@telkomsa.net