Re: 850 yard elk rifle
I think you would be well off with any 7mm mag or 300 mag of some sort. They'll easily kill elk to 850 yards on the far side with some of todays bullets.
Your right about the kick on the EDGE. I wished mine kicked like a 243...Mine weighs around 13lbs w/ammo, bipod. I have the DE brake, and the orginal remington recoild pad on the LSS stock, plus a limbsaver slip on over that, and I still get a bit of a bruised shoulder from shooting prone, granted I weigh 150# but its more like a 7 mag still. Spotting my own shots even at 1K with a 20x leupold is non existent, must have a spotter. Unless your EDGE is 15-16 lbs, its still got kick behind it...
Also right about the cost. 90-92g of powder and 300g slugs aren't cheap. At least $1 a pop.
I'm thinking about keeping my 7 mag around just for that reason. It reaches out to 1K very nicely with the 162g amax or vld and only burns 61-64g of powder to do so. And even in my stock rem 700 BDL w/holland brake (lightweight rig), I can spot my own shots and dont need a spotter. It kicks like a 243.