I will look into sheet metal molds. I have a friend with some equipment and will see if I can use any of it for a mold (all the experience I really have is what I learned in high school metals production).
Also, im interested in .22WMR, both from rifle and snubby barrels, becuase I am interested in using it as a hunting round for small-medium game (possibly up to a small whitetail). I also want to test it from shorter barrels just to see how it compares to other calibers as a self defense cartridge.
BTW do you know what guage the steel is for your mold?