Other powders worth a look -- it you had a supply laying around -- might be Norma 203B IMR 4320, AA 2700, and perhaps N530 (very close to 4895) -- or, going the other way, even N550, which is really dense stuff, you might be able to get enough in a Dasher.
Joel & I got a Dasher reamer, and as soon as one of us gets healthy enough to stand over the lathe, we'll chamber up a barrel. I do see all the powder suppliers seems out of Varget, 15, and 4895. Seems like the Dasher folk are hording again . . .