ONE GUN?

[Dhoey07]

.300 win mag, just because i own one 

[rbros]

Of your list....probably the 300WM.

I wouldn't however choose one of those on the list for my personal one gun.  My one gun would either be my 7mm Rogue or 338 Edge.  7RM would be a good choice as well, but the 7mm Rogue adds another 150fps and seems to be pretty efficient with cheap brass.  The Edge, well, it just flat out kills.

[Gringo31]

All of those rounds will do it. Sounds like you just want some justification so go huge 

I wish more people (including 2 of my brothers) would spend the time they spend on the range vs researching ballistic charts and playing with all the different types of bullets, powders etc.  If they would just by a 30-06 or a 7mm or even a 270, and spend their free time actually shooting it and being comfortable with it, they would have fantastic results.   

[Blacktail Sniper]

.300 Win Mag     As soon as I finish, refinishing, the walnut stock to swap out the "plastic" one.

[Sniper101]

Lazeroni warbird...just kiddding, 7mm RUM

[hunting4sanity]

A guy should NEVER limit himself to one gun for anything, but for elk I'd usually go with my 300 RUM.

[Bean Counter]

All of those rounds will do it. Sounds like you just want some justification so go huge 

+1. Given the choices I'd go .308. Keep your ammo cheap and your optics expensive and keep practicing.

[KFhunter]

30-06
find ammo dam near anywhere
 
I bet 99% of people with "big guns" can't shoot a 1/4 what the gun is capable of

[Dan-o]

300 WSM just because I don't have one and I want one!

I doubt too many deer, elk or bear would notice the difference between my WSM and my 30-06, but I'd feel good walking around with my new rifle!!!!

[Holg3107]

easy call. 300wm 

[RubblesPH]

One more vote for 300WM.  Great results on everything I've shot with it....small game - AK moose. 

[longrangekiller]

7mm mag

[JCKILLSHOT]

30-06

[RG]

.280 Rem.  I love it, sold my 7 mag and .338.  Kept the Mod 94 .356 winchester though.

[predatorpro]

hands down my 30-06!