Here is the regulation for Colorado.
3. Handheld bows, including compound bows, using arrows equipped with a broadhead with an
outside diameter or width of at least 7/8ths of an inch with no less than two steel cutting
edges. Each cutting edge must be in the same plane throughout the length of the cutting
surface.
a. During the archery seasons for deer, elk, pronghorn, bear, sheep, goat, and moose, only
lawful hand-held bows may be used by archery license holders.
b. Bows must have a minimum draw weight of 35 pounds. The let-off percentage shall not
exceed 80%.
c. No portion of the bow’s riser (handle) or any track, trough, channel, arrow rest or other
device, excluding the cable(s) and bowstring, that attaches to the bow’s riser can contact,
support and/or guide the arrow from a point rearward of the bow’s brace height.
d. Bows can propel only a single arrow at a time and no mechanism for automatically
loading arrows is allowed.
e. Equipment using scopes, electronic or battery-powered devices cannot be incorporated
into or attached to the bow.
f. Hydraulic or pneumatic technology cannot be used to derive or store energy to propel the
arrow. Explosive arrows are prohibited.
I haven't hunted elk yet, but I plan to. I'll use a razor sharp Zwickey on a high FOC carbon arrow perfectly tuned for and shot from my 52# Kanati. It's about 50 percent heavier than required by law in Colorado and I know I can put my arrow where it needs to go. If I can't get close enough to do that, I'll just enjoy the hunt. A 60+ pound bow won't make me shoot any better or any farther. My creaky old shoulders won't let me shoot that heavy anyway. If I put an arrow in the chest cavity, I have no doubt that it will pass through any elk. I would have no confidence in a shot anywhere else with any weight bow.