of my plethora of rifles, two calibers occupy more than one space in my safe. I have 2 30/06s and 2 7mags. I was given a 06 (wooden ADL with a trusty ol *** built 3x9x32 Tasco that is still kickin today on another gun lol) when I was 12. That was 21 years ago (damn Im gettin depressed now!) and that ol 06 honestly has somwhere between 60-75 deer too its credit. I bought a 7mag as soon as I turned 18 and could legally buy a rifle. It only has about 20-30 deer too its credit. But it didnt take long to realize that inside of 400yds on deersized game, what the 7mag will do the 06 will do. And without much recoil, a 24"+ barrel and cheap ammo thats readily available. I rarely shoot either of them anymore, but I know in a blink that they are certainly MORE than capable of whackin em with authority!
The other two rifles were handed down too me over the last year or two by my step-father (who passed away last month so they mean ALOT too me so they will be kept). I look forward to carrying them occasionally.
I would cringe at the idea of only being able to own 1 rifle, but if I did and it was a 06 I doubt I would be any less of a successful hunter than I have been too this point!

RA
ps
I have 3 kids (4yr old son, 6 yr old daughter and a 9yr old son) and when they are old enough for a full sized rifle I will probably give them each a 30/06 when they begin to drive and hunt on their own. (That or a 300WSM, who knows what the future holds?)