Greg Buchel was born and raised in Chicago but “escaped Illinois” to move to Wyoming and founded Big Horn Armory which touts its AR500 as the world’s most powerful AR-style rifle. Buchel says it will down anything from "pachyderms to Peterbilts."When it comes to bagging big, dangerous critters, hunters want all the knockdown power they can get, and a Cody-based company has taken that to the extreme.Big Horn Armory Inc. touts its AR500 as the world’s most powerful AR-style rifle. The semi-automatic weapon is chambered in the company’s own .500 Auto Max cartridge and can thump out half-inch diameter bullets...