Try removing the barrel from the stock, so you can look at the bottom of the barrel near the breech. That is where most proof marks are found, as well and manufacturer's ID marks and information on the bore diameter.
ON the inside of the lockplate, you often find more information as to origin.
Molds are available from many companies, if you are willing to pay the price. Most of all you need a bullet sizer for your bore diameter( .001" smaller than actual bore diameter). Lee Precision, Lyman, RCBS, Rapine, NEI, Tanner, are just some of the sources of molds. Not everyone is going to have a bullet in your caliber, but they may be willing to make a mold to your specifications.
The sizing dies are usually made to work in a standard cartridge reloading press, but some can be used in a simple arbor press, or even in the jaws of a bench vise. Some are stand- alones. The use of the dies are essential for best accuracy. If you order a hollow base mold, you can try shooting them with the hollow bases clean and empty, or by filling the base with grease, and then using an OS card behind the bullet to push the bullet out the barrel, and seal the gases behind the bullet. Some use paper patching to achieve similar small groups.