This isnt average, but I have put alot of 100# + quarters on my back. Weighed them. When I was young I cut between 3-4 rib and would saw or axe 1/4 down middle. I have shot a pile of 6x6 NW MT in tough mountain high snow country, they are big shouldered. My hunting buddy took a large 6 pt. in 2011 that had 140 front and 120 rear as described 1/4s that is 520 #'s , he shot a bull that size this year also. These I would refer to as ranch type special tag elk that run very large in body and horn.Bioligist thought elk 6-7 years old. We had two canadian moose in freezer at same time, one was 57'' 1/4s where front 120,rear 115 cut the same,so that gives you the idea.There are some big elk out there. A friend that was a local meat cutter shot a local elk about 20 years ago that hit the 1000 mark,west of Kalispell, it had 29'' fourths and gross about 370, was a very large pope bull for MT at the time.