Re: that Red dot data chart.
I have loaded Red Dot for years in both rifles and handguns.
Those velocities don't seem right.
The predictions above are for loads that are very much outside of the "normal" parameters where Quickload seems to do pretty good. With small charges of fast powders in rifle barrels, I think the software tends to overpredict velocity as there seem to be losses that matter but are not modelled. Another factor is ignition. With all of the free space in the case, actual ignition can easily be less effective than the model predicts. Still, for someone working up plinkers, the Quickload output provides some guidance on what to expect.
I looked up some old chrono data and found results for some 30 Herrett loads with Promo (bulk version of Red Dot).
With 4.6 gr Promo under a 110 gr plinker in a 10" gun, Quickload said 1123 fps, chrono said 1118 fps
With 5.0 gr Promo under a 110 gr plinker in a 10" gun, Quickload said 1168 fps, chrono said 1160 fps
With 5.4 gr Promo under a 110 gr plinker in a 10" gun, Quickload said 1215 fps, chrono said 1195 fps
With 6.4 gr Promo under a 150 gr Lee in a 10" gun, Quickload said 1172 fps, chrono said 1142 fps
With 6.4 gr Promo under a 150 gr Lee in a 14" gun, Quickload said 1251 fps, chrono said 1190 fps
Note the above a chrono numbers are "as indicated", screens were probably at least 12 feet from muzzle.