I've bow hunted that area, actually about 40 miles West of Montrose up on the Uncompahgre. I too think 300yds will be a long shot for you Pard, probably average around 150! Having said that, your 30-06 with a good 180 or 200 Partition is perfect. "IF" you want a dedicated "all around elk rifle", may I suggest a sporter weight 24" barreled 338 Winmag and either 250gr Partitions/Swifts/other Premiums or, if you want a bit more range, the 185 TSX. Scope no bigger than a 2.5x8 or similar ( even 4X is fine!) This type of rifle will fit a saddle scabbard well. The 250 Premiums and even the 185 Barnes will usually shoot through an elk from almost any angle, at least break him down. You "will" get more shots at hard angles than the classic broadside, and on a money hunt, you want to hedge your bet, so to speak. At the end of a long, tiring hunt, when you see an elk, you "will" want to shoot him ( partly from Revenge! ha) and a heavier gun can make a difference. If you don't want a 338, a Sporter weight 35 Whelen (or Ackley Improved) is very pleasant to shoot and kills very, very well, maybe indistinguishable from the 338 out to 250yds! But you can usually buy 338 Winmag ammo ( if need be) anywhere in elk country, not so with the Whelen. Have a ball and let us know what you decided on, we'll go hunting with you "vicariously", ha.