RE: Montana Mule Deer Gun ?
as said already, all great guns...all will do the job..shoot the gun that your most comfortable with...and have ZERO flinch with...KNOW the load, and you will connect...
when shoot distances in a canyon, lots of varieties in wind happen...so make sure you watch wind through teh shot pattern...but for me this is minimal issue as I have never shot an animal over 150 yards...but lots of peope like to talk about shooting big distances out west...
personal favorite calibers are .280 and .300 win mag...but your calibers will all do well..personally woudl stay away from 30-06 with heavier bullets as trajectory can be sacrificed but once again, the distance is the key...