This is a takeoff of my other thread ('Which Three Centerfire Rifle Calibers For Hunting?'). The idea in that thread was to use a 3-rifle battery for all North American game, but I wanted to kinda go in a different direction with this thread (more about theory). The three centerfires will be backed up by my "all-around" 12-guage shotgun, a .22 rifle, & a 9mm high-cap pistol. From the great responses in the other thread & my own limited knowledge, I'm beginning to believe a 3-rifle battery (more or less a small bore, medium bore, & big bore) should be anchored by a versatile medium bore like a .30-06, the small bore should be really small (like a .204 Ruger), & the big bore should be really big (I'm not familiar enough with them to even confidentally name an example, but maybe a .415 Rigby?). Does anyone agree with that theory? Keep in mind I'm essentially a beginner & I've learned what I know mostly by reading, not experience. That said, I want to make hunting my main hobby for the rest of my life & when I decide on a hobby, I go all out. Anyway, I have a few questions. What is the basic difference in the magnum calibers? Are they mainly for longer ranges? Are they versatile? How would you compare the 300 Win Mag to the 30-06 for the medium-bore gun? Can you load the 300 Win Mag from light to heavy like you can the 30-06 (factory loads, not sure if I'll get into handloading)? I really appreciate any help I can get.