I do reload and would like to hear the favorite reloads other people have been using. I'll post the bore and throat dimensions as soon as possible.
I can always count on the Hercules (now Alliant) "Big Three" powders: Bullseye, Unique, and 2400. It might surprise some folks, but I've found a "light" charge of 14 grs 2400 to work well. 7.5-8.5 gr of Unique is always good; somewhere in that range you'll find your gun's "sweet spot". And, 4-5 gr Bullseye is a classic target load.
Other good powders are Herco, Red Dot, IMR 4227, to name a few.
But, efforts spent matching cast bullets to your cylinder throats and bore will reap dividends beyond just powder choices.
One caveat: if your cylinder throats tend towards the larger side (ie: .431"-.433") and you size your cast bullets accordingly, beware of sizing dies that squeeze your brass too much. I've seen sizing dies that reduce brass to an I.D. of .424" or so. Yes, you can correct this when you expand the case mouth. But, that's hard on the brass. And, you may still not get the brass open far enough down to prevent swaging your bullet base. Sizing dies can be lapped to open them up a few thousandths of an inch. Your cast bullets will be much happier.
I have a set of Redding dies that were so bad .44 Special brass ended up looking like 44-40! I asked Redding and they said that's "within spec". So, I lapped the sizing die up to where my sized case mouth was .430". The expander just kisses the case mouth to open it up to .434". My (soft!) cast bullets love it!
However, Colts have a reputation of having tight bores (.427-.429") with cylinders anywhere from .430"-.434". So, your situation may end up being very different.
I guess they don't come cheap. That's even higher than I would have guessed. Beautiful gun, probably an investment, my pockets aren't that deep 
