I got my first chance at shooting my SR556 that has been waiting patiently for me in the safe for almost 5 months. I finally went to shoot yesterday and the first 30 rounds through either jammed or did not eject. After manually ejecting and digging out jammed shells and going from setting to setting on the cylinder. She opened up and shot with no issues. Not sure why it wouldn't shoot correctly or how I fixed it. But the next 150 rounds shot smooth as silk.
I was using iron sights and a EOtech at about 75 yards.
Some of the shots did actually penetrate the plate.
I had plates burned at work. I realized after the first shot that they had burned the wrong material when the plate mushroomed out.
I was using cheap standard American Eagle .223 (Blackbox) from Gander Mountain.