Yeah, I followed that energy mantra up until recently, largely due to this forum. The fact that almost all bows are under 100 ft/lbs of energy shows how ridiculous that measure is. My longest shots were both at 400 (.308), and both elk, and I'm putting in the practice to get to 500 (new 6.5CM), my "long range" goal, so I'm with you on shooting 900, but I'm sure there are the rare few that can do it ethically. Me, I'd rather hunt closer anyway...
Without getting off subject too far, I think you should look at the damage to MOOSE with the .223 tmk in the .223 thread. Apparently they offer similar lethality to high end lead bullets out of magnums. I don't want the meat loss and lead atomization into the meat, so I'm sticking with 6.5CM and copper bullets, and 500 yards. But, its tough to argue with the proof in that thread that tells me that magnums are silly. That, and I've punched a 1" hole through an elk with an arrow, and killed 3 elk with a 30-30 (1 DRT, 1 70 yards, and 1 crawled 50-100 yards in a few seconds).
Just trying to help people shoot better (recoil) and waste less precious animals. The west is getting swarmed with people, and there aren't as many deer and elk to go around.
Dumpster fire started
suppressed, either of your existing rifles would be pretty mild with an 18-20" barrel as well