Leave it to a self identified PREPPY to confuse caliber with cartridge. Sorry could not help myself, I say that tongue in cheek. So you have identified 2 potential criteria, long range hunting and prepping. Prepping would indicate a popular "universal" cartridge that could be found everywhere. So a lot of 6.5C around, 300 Win MAG, 7mm Rem MAG and good old 30-06. 308 Win pretty universal but not my 1st choice for long range. Hope this gets close to what you are asking.[/QUOTE
It's been pointed out numerous times.