I would not load that brass-framed revolver very heavily. Most experienced users agree that 30 grains of FFG or equivalent is the maximum load in a brass-framed .44 revolver.
Cap and ball guns are marginal for deer. They'll do the job but you have to get close and you must use a powerful load.
I wonder if your revolver, with no more than 30 grains, even with its longer barrel is up to the task of taking a deer humanely?
For info on using your cap and ball revolver, search my name Gatofeo.
You'll find a good, basic post dated July 6, 2003 and titled, "How to properly use a cap and ball revolver."
Also, you'll find a post on making your own wads, and a good source, in my July 5, 2005 post entitled, "Found! Source for making felt wads!"
I have a ton of other posts on cap and ball revolvers, but these will get you started.