This started from Full30.com, with a call to the .308AR Ambassadors to help with zeroing irons on a .308AR.  It ended up as a shoot this last weekend, and me testing out the 13.5" gun at 100~400 yards.  Since I posted it all up at Full30.com, I'll copy it here: Tested the Witt Machine brake on that Win Mag today, and it made a world of difference. Did get the 13.5" .308 out today. Here’s how it all shook out, and this gun has a 50-yard zero on the red dot. Here’s the shoot setup: