You'll have a lot of fun shooting your pistol.
I'm pretty sure you've read by now that there never was a .44 caliber Colt 1851 but when the Italians came up with this idea they created a gun that is a real hoot to shoot.
It has the pointability of the .36 caliber Colt 1851 revolver with the Boom of the Colt 1860 Army (which was made in .44 caliber).
My first blackpowder revolver was a .44 caliber Colt "1851" and I got a lot of enjoyment out of it.
Then, I let my mind start controlling my actions and decided I wanted all of my Civil War pistols to be Historically Accurate.
That meant selling the .44.
Later on, I wished I would have held on to it because although the .36's are fun the Boom of the .44 is more fun.
I have a .44 Remington and a .44 Colt 1860 but they just don't feel the same in my hand as that "Colt 1851 .44" did.
As you will read, if your gun has a brass frame (the frame, not the trigger guard), keep the powder loads on the light side. Somewhere around 22 grains will do nicely.
If your gun is a steel frame like mine was you can use any powder load that will still allow the lead ball to be swaged into the chamber so it is below the face of the cylinder.