Got a 20" barreled AR in 6.8 spc and plan on doing some big game hunting (most likely next year due to time restraints and no idea where to go and have luck). What's every one's no b.s. assessment? -Deer....bullet weight for mulies or black-tail? I've seen a 280 deer fold up after taking a 55 grain .223 round through both shoulders, and personally dropped a deer in a firearm restriction gmu years ago with 00 buck at 70 yard (head/neck shot mostly) with a 12 gauge, so I'm pretty confident 6.8 will drop even the biggest deer I'll ever encounter. -Elk?....got enough power? -Black Bear?....got enough power? -Antelope?....longest realistic range I should be shooting at them? (thinking of doing an out of state hunt next year) Not really looking to get ballistics charts and arm chair commando opinions. Would like to hear from someone that's actually hunted with a 6.8 and see what they think of it. Thinking about picking up a 6.5 grendel next year and trying that for elk and maybe black bear.