You are going to be very limited with what you can do with 700X. It is a very fast powder, in the range of Clays and Bullseye. All it is going to give you is the equivalent of light target loads for the 44 Mag.
Definitely stick with lighter bullets, and look for Cowboy Action loads using that powder.
The powder is not really fast enough to get velocities up to where you need jacketed bullets.
At 8 grains per load, one pound of powder will load 875 cartridges.