I had these aluminium plates in the garage, and so, for the sake of science, we shot every load we had at it and recorded the source. I had meant to also record the type and brand of ammunition used, but four hours in the desert sun must have frizzled our noodles because we tossed all the empty boxes. Click the pics for notes. Other pics of the blessed day can be seen here, and here.
The new AR shot like a charm and the sights didn't require any adjustment for shots up to 75 yards from a standing position. One thing I had forgotten, it does get flaming hot in the desert sun.
The surprise performer for the day was the CZ-52, an ugly and uncomfortable gun designed well before ergonomics were a matter of concern, and yet a real solid ballistics performer.