My brother came out. We shot loads over the chrony. We shot loads into the water trap.
We settled on 5.1 grains of Unique, W-W brass, 124 gr Speer Gold Dots and a COAL of 1.125". Measured low velocity was 1053 fps. Measured high velocity was 1109 fps. Powder charge is 12% below the maximum listed for that recipe on Alliant Reloading Data website, so it is pretty tame.
For future reference, the median velocity increased by about 10fps for every 0.1 grains of Unique added.
All data collected from a Glock 19. The Glock 19 is listed as having a 4.01" long barrel.
The Gold Dot round fired into the water trap was as pretty as a flower. I let my brother keep it as a souvenir. I told him it was "Eaton Rapids Jewelry".
The Berry Bullet Target Hollow Point did not expand even at the increased velocity. We sectioned one and the lead will not mark with a thumbnail, so it is pretty hard. They really are "target" bullets.
It was cold out there. My glasses kept frosting up as I went in-and-out of the house.