Just make life simple - get a 308
Yep.
When the boys get to talking rifle cartridges and they begin frothing at the mouth, their eyes glazing over with lust for the cartridge of the month, they'll inevitably ask what you shoot. When you reply "308", they quickly move on and you don't have to engage in a drawn out, inane conversation over minutiae. Meanwhile the old hands know what works; simply pick up a 308 and go hunting.