As for your keg of bullseye find an older Lyman manual or some older Hercules data, plenty of data for lots of cartridges, mainly in reduced loads.
All of those can be decent powders for the 44 mag depending on the the bullet weight and performance levels your after. Unique will "work" in about any 44 mag bullet weight. It is at it"s best in the 44 Mag when used in cast bullet reduced loads. It is too fast for best performance with heavy loads and bullets. I have loaded many 1000s of soft cast 240 grain Keith semi wadcutters and 8.5 grains of Unique for plinking. I have several buddies who use nothing but Unique in all of their 44 mag loads. Blue dot is not popular but I have several loads for it that work well in my two 44 mag rifles. It will put up some pretty impressive FPS numbers in both of them with 240 or heavier bullets. It is not good for reduced loads or light bullets and I have never have found it to be anything special in the pistols. A tip is to try both magnum and standard primers if your going to play with Blue Dot in a 44. I have found big differances in accuracy by switching (and working back up) Actualy BD is seldom mentioned as a 44 mag powder except in Hercules data. It is on the fast side of optimum for heavy loads except with light bullets.
2400 and 240 grain hard cast bullets are about as good as it gets in a 44 mag. The classic Keith load as printed everywhere is 21 grains. In some guns this is right up there pressure wise.
I know you didnt ask this but my current favored powders are none of the above actualy. 296 gets tha nod for anything heavily loaded, 231 for plinking loads. I dont load anything in between.