Be careful to use the same headstamp in each reloading session--unless you plan to trim all of your cases.
The reason is that the .44 Mag functions best with a good, firm roll crimp. Also, I highly recommend RCBS or Lee dies--the expander is of a small enough diameter to ensure a good bullet "pull", referring to case neck tension.
If your case lengths are different, you will end up crumpling a few cases before you catch it. For jacketed bullets, make sure that you crimp firmly into the cannelure.
My favorite powders for the big .44 are:
For light loads:
Bullseye (first powder I used!)
HP38
W231
Midrange loads:
Unique
Blue Dot
Herco
And, for those heavy (really get your attention) loads,
W296
H110
Suggestion:
Order 1000 cases from someone. They'll last you forever! I am still loading off of the original 1000 Midway cases I got in 1986.
Good luck! Now, go forth and make fireballs.