Also shot out to 1360 yards with the 147 ELD-M using a Harris bipod. The ES is pretty big for that distance, and the prediction from my app was off for the first shot. Elevation was 2-mils low, but with perfect windage. I saw the impact, and added the 2-mils of elevation. Impact! Cheap fun.
Update - The prediction from that app was jacked up. With AB, JBM, and 4DOF, the impacts observed seem to jive with the predicted values. I need to spend more time getting shots on steel or paper to see the vertical dispersion and distribution. More velocity data as well.
