Thread: 44-40 Powder choices

I've been loading for a 44-40 Uberti 1873 for a while now.
I have two loads which are very accurate:
AR2207 26grn with 240grn Projectiles. Powder is compressed in this load.
Bullseye 6grn with 200grn projectiles.

The AR2207 load is good but unnecessarily hot for a target load and on the pressure limit I'd consider for the 1873 toggle link action.
The bullseye load is a pleasure to shoot and very, very accurate at 50m (yesterday key holed three shots measured at about .4" group).

However, the bullseye load varies in velocity by 220+ FPS in a load that averages around 990-1000 FPS. As a result I get quite significant vertical dispersion at 100m, it seems to hold together to 50 but the effect is marked at 100m. Enough that I won't be able to hit a target at that distance consistency.
I suspect this is because of the small amount of powder actually in the large case and ignition varies wildly as a result. I also don't like how little powder there is in the case as it would be possible to at least triple charge the cartridge and have no problem seating a bullet - my reloading method avoids this possibility but still irks me.

Does anyone have any suggestions for a powder that will deliver similar velocities to the Bullseye load but has far greater bulk with a powder that might be available.
I know a similar load of Winchester 231 would be about the same velocity but the Lee Volume Measure Density data shows that the volume of a similar charge of Winchester 231 would be smaller than Bullseye which may have the same issue.