I have never used the 444 casing but i do load no 12 in 45colt.
for the mouth to keep the shot in place, sharpen the end of a casing and punch out a wad from a piece of styrofoam and then use an electric glue gun to hold it in place over the shot.
Or, if you cast you can reverse a 44 gas check, and then electric glue gun in place.
the powder load of unique is about the same as i use too.
