Ok, I settled on 9.3gr of TiteGroup with CCI-550 large pistol magnum primers. (Up a tenth of. Grain from the test.) I had some LabRadar issues, so no recorded speeds.
I’m stupid for forgetting to set the projectile weight….duh!
The temperature was right at the freezing point, fyi.
They felt really good. Seemed to have good energy at 100m, as they hit the steel pretty good. Recoil was manageable. And no pressure signs. I gauged the fired brass in a case gauge afterwards. They were not tight (a good sign). (The range pick-up once fired factory cases I found were very tight in the gauge. Just as a comparison.)
Accuracy was very good. I was ringing the 5” steel at 100m (supported).
So it looks like H110 will be reduced to my second choice powder for the .44mag load for the Marlin 1894.