Well, nobody would have had a 1851 model Colt Navy in .44 caliber in 1852. They would have had one in .36, because that's all that Colt made at the time. Also, odds are they would have used the flask that Colt sold with them, not some tiny little thing like you are talking about, and kept it, and spare balls, and maybe a bullet mold, in the saddlebag on the horse. Reloads for a cap and ball probably would not have been kept in a pouch on the belt, unless they were the paper cartridges, because re-loading a cap and ball with separate ball and powder is not going to happen during a fight! That's when you'd pull out your fighting knife. I'm also not too sure that a model 1851 would be all that common in California in 1852. Much more likely pistols would have been the Model 1849's and the Pattersons.
Deadguy;
You are right on all accounts. First, this pistol will probably never leave the holster; and if someone can tell a .44 Cal 1851 from the backstrap I will tip my hat to them and graciously accept my ignorance; I just have this thing about owning a .36 Cal ... And true, a real cowboy would have the Colt flask on his horse ... but Californios looked on pistols with a fair amount of distaste, and if I were going to be a docent on horseback, I would be carrying a sabre mounted to my saddle as well as the Belduque tucked into my Botas (which is being made as we speak). So any small flask (and dozen balls) would be just walking around protection in case the first five or six did not do the job. BTW, I just had an email from Dixie Gun Works that my little HA0252 will hold 1/3 pound of powder ... so I am thinking that I have at least a reload or two in it....
Since I am aiming at a Sacramento Area Californio circa 1852-3, it would be quite easy to pick up a 1851 from the Colt Distributorship in San Francisco (the first Model 1851s leaving New York in April of 1850). San Francisco would have been an overnight riverboat or a couple of days ride from Sacramento ....
J.D:
Always a pleasure to hear from you .... and I looked at your flask ... yes, it would have been nice to use, but this one is bought and paid for ... It is a Dixie Gun Works HA0250 and I think I can get it rethreaded to fit any of the normal sized powder tube measures .... and I would need to fill three of the largest measured tube amounts to charge each of the .44's cylinders (With the Sykes)....
P.S. My Flask has a Mexican Eagle on it ... which would be something a Californio might like ....