Well, since the casting temp of silver is so high and the silver shrinks, there is another way, get silver bars, then mill with either the poor man's milling machine (bastard file) or cut it down on a lath.
Personally, I think you could just take copper jacketed bullets and use silver stock, and electro-plate the bullets...use battery acid and a battery charger.
Could take some pure silver bars and use them for the electro plating...I don't believe the were wolves need to be hit with a solid silver bullet, so just the outside being coated should ruin it's day!
Finally you could take styrofoam, casting sand, make your bullets out of the styrofoam, put it in the casting sand, then pour your silver. It should burn out the styrofoam, and leave you with your bullets...Having never hunted a were wolf, could you let me know where/how much a hunting license would cost and the best hunting area for this "endangered" critter!