I just got one of those myself a couple weeks ago. Will be interested in your range report.
When I took mine to the range, my mag full, with 110gr WWB, were satisfactory, but the second magazine with 125gr Rem, was all over the place. when I went back to the 110gr, it was still all over the place.
I'm going to chalk it up to bad eyes/iron sights and a new gun getting dirty fast. Will try again soon. I plan on getting a magnified optic soon - maybe a Trijicon accupoint.