Try is as cast, and lubed. It may work just fine.
Look up, and do a "pound cast" technique to get an accurate measurement of your chamber throat. Ideally, the bullet should juuuuust slip into the throat ( ie 0.0005" smaller that throat diameter) .
Try some Lee liquid lube. May have to lube it twice.
If you don't have to resize, and can get away with a single Lee Liquid lube application, you will have a simple, low cost cast bullet shooting system. If you need gas checks, ( for MV over ~1200 fps )then you need some toys. Might be able to use a Lee push through sizing die and push through a gas check to seat to the bullet. May have to open up the push through die to the throat diameter ( or see of Lee makes custom push through dies to your desired diameter.
