I asked myself this very question about a year ago. I too liked the 7mm and wanted a rifle for deer, elk, and moose. I think the .284 Win in an excellent choice. Good barrel life, great 7mm bullets and ballistics, very manageable recoil, and we all know they're accurate out to 1000yards. What is there not to like for a long range hunter.
I built a .284 Win on a short action Surgeon. Every component I used was carefully selected to be both accurate and light. It has a 1:9 #5 Kreiger finished at 25'. The #5 is the smallest contour Kreiger will cut a 7mm stainless. It's in a McMillan A3, which is again a weight compromise between the A5 and a HTG. The AI mag sits in a Badger M5 bottom mettal. I can only fit four 284 cases in the five round,308) mag. The Leupold VX-3 is a 6.5-20X40 LR that weighs in at 15.5oz. It sports a Jewell HVR trigger.
I can't provide a range report yet because it came in yesterday. I've turned down my Win brass to .313 for the .317 neck giving 2 thou clearance per side. Dave made my reamer with .090 freebore for mag length COAL. I'm trying some RL17, H4350, H4831SC with Nosler 140 & 160 Accubonds, 150 Ballistic Tips, and Hornady 162 A-max's. I'll let you know what combination it likes best, my COAL will be 2.88 in the AI mag.
Hope this gives you a few ideas. Here are couple pics.
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RussT, I just read your comment/question and agree with you completely about shot placement. I'm an archer also and truly value a well placed shot. With a rifle more is not always better. Anyway, the free ballistic software Point Blank has a Taylor KO calculator. Basically what it does is takes you BC, bullet weight and fps to give you an efficiency chart for most big game animals based on distance. Example: my 160gr Accubond,.531 BC) going 2800,estimated) is good for elk up to 300yards, from 400 to 700 it's marginal, and poor past 700. I wouldn't say it's a definitive tool, but it gives you a ball park.