Just back from the range with results:

265 gr. Cast Performance WFNGC, 24 gr. H110, CCI350 primer for 1579 fps 1467 fpe 11 fps AD 14 SD

300 gr. Sierra JFP, 22 gr. H110, CCI350 primer for 1407 fps 1319 fpe 10 fps AD 15 SD (Note that this load came closest to shooting point of aim at 100 yards.)

300 gr. Hornady XTP-HP, 22 gr. H110, CCI350 primer for 1431 fps 1364 fpe 22 fps AD 30 SD Note: The bullet has been seated out to the second cannelure. I'm going to try it seated to the first cannelure. It does not feed well seated to the same length overall as the Sierra bullet!

Free recoil energy of these loads is about 17.5-18 fpe.

I had another interesting experience. 4 times I looked through the aperture to see no front sight. I just picked it up off the ground and stuck it back in. You see, the factory heavily greases these AND stakes them. As the base is a tapered wedge, you can reinsert them fairly accurately and if I choose to retain it, only need to stake the one end of the dovetail. It is my OWN fault that I removed the sight earlier and pending the results of my experiments, haven't correctly reinstalled it.

Of course there was a wind from 3 o'clock this afternoon so, combined with the front sight laterally shifting to the right, my groups were somewhat larger than expected.