A local shop owner killed a very large bull shooting Hornady 195g subx subsonic loads from and AR pistol a few years ago. It was a fenced pay to play hunt about like going out in your pasture to shoot a moo cow. It worked but wouldn't be on my list of weapons for a wild elk hunt. I don't like to have to pass on anything but short perfect unpressurred shots though.
After have to shoot a cow elk twice with a 7-08 a few years ago even though the first was well placed and watching a cow take a solid shoulder hit from a 180g .308 accubond and then disappeared after a mile and a half of uphill tracking I prefer a little extra power on elk.
