If history has any appeal to you, the 1851 was only made in .36 caliber. I have one, and it's a great gun. If you want a .44, try the 1860 Army. They're comparable in speed of loading, accuracy, etc. The .36 uses 15 - 20 grs of black powder, while the .44 uses 25 - 30 grs. One saves you some money in lead and powder (not alot, though), the other gives you more bang. Can't go wrong with either.