Thread: One gun?

Guys without starting a dick fight I'd like some opinions, I no this has kinda been done before but.....
We have recently started a casual guiding business on the farm, and has sort of got me thinking, some people have not shot a gun before so I cant really give them the edge, similarly I'd rather a 243 pill wasn't poked in the wrong spot to put a first timer off.
So if you had pic a caliber to shoot 0-500
For arguments sake the 500 is in perfect conditions, most shots under 400,that anyone could shoot what would it be?
What glass would it wear and would it have can?

Keep in mind that anyone needs to able to shoot it comfortably.
Advice Appreciated
Thanks


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