TB is so great stuff for light to medium lead loads.........
it works in my 2-6" revolvers.

If you want to fill that case.............
Red Dot will fill it in a hurry over Unique. Found this out while loading 9mm. In the 9mm with a 124 fmj seated the powder is near its base with:
4.5grs of Red Dot vs 5.2grs of Unique.
Just don't know if you want to use that powder though.

I was amazed at how bulky red Dot was. Now I understand why my 12 Ga. loads call out the data, which I thought was off.
Never know what you will learn, when reloading.

Good luck.