I think that you may be thinking 150 Grain Noslers. I do not think that they even make 160 Grainers for .264 only when you step up to the .284 caliber do you get the 160GR. option( .280 Remington, 7 Mag's) Noslers are very good bullets but the most important thing is bullet placement. I have my mom shooting 150. Grain Speer Nitrex factory loads from her Remington 700in 270. She has killed every elk with one well placed shot for the past three years.
If you show up with a tree stand your guide is going to have you sleeping on it. Elk hunting is similar to whitetails in the sense of the animals cunningness but that is it. You have to travel light and be prepared to hike. Colorado has alot of elk but they often move due to hunting pressure. Last year I spent three weeks in the Williams Fork chasing them with a bow and each day I covered at least 6-8 miles. Do your guide a huge favor and get into shape before showing up. You and your guide will both have a much more enjoyable time plus the odds of getting an elk will increase drastically.

I am a 100% stalking hunter. The only time I sit is first thing in the morning or when I hear bugling. Then it is time to dig in and watch very closely. I hunt both with a bow and a rifle and am 100% for bringing home elk meat each year. I killed my first elk with a 30-30 in dark timber and my last elk fell to my 7mag using 160 Gr Noslers. I just bought a cannon though and will be using that come 9/15. It is a Remington 700LSS in a 300RUM with a Burris Black Diamond 4-16x50mm AO with Mil-Dot reticle and Posi Lock. It is my baby. I had a trigger job done to it, muzzle brake and Pachmayr decelarator recoil pad added and topped it off with a Harris bi-pod. I am shooting sub 1 inch groups at 300 yards using Remington 180 Gr Noslers.
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I've read on here that a 270 is the min caliber for Elk. Well, I'm gonna be in Gunnison this October to see if I can fill my either sex tag and I'll be taking my Sako 270. Should I use 180 Noslers or bigger? Is this adequate to drop a bull without having to track him for seven counties? Should I chance a shot through the shoulder blades or should I just try and hit him behind the blades?

I've always shot whitetails throught the front shoulders and I've never had to track deer for more than a couple hundred ft. But, I imagine that an Elk's shoulder blades are probably a little tougher.
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