Last weekend I was popping clay pigeons on the 300 yard berm with my Rock River LAR-15 with 16" barreled 'Coyote' upper. This with a 2x scope. The only customization was the trigger had been replaced with a Ruger Elite 452.

Pigeons at 500 and I was wasting my time and bullets, but not by much (misses were close, just not close enough). Probably would have done better with higher powered scope.

At 600 yards I couldn't even tell where the bullets were hitting.

Coyote Hunter - NRA Patriot Life, NRA Whittington Center Life, GOA, DAD - and I VOTE!

No, I'm not a Ruger bigot - just an unabashed fan of their revolvers, M77's and #1's.

A good .30-06 is a 99% solution.