Good thing you didn't make them out of real silver! I got my issue of American Rifleman and they had 2010 American Eagles for $21 a pop, I bought the limit and wish I could find 2-300 more. Making bullets out of silver would be a spendy proposition!
I was watching something on Discovery and they were making some ammo from Silver, because its so much harder than lead and copper it would not grip the rifling and wasn't very accurate. If you are hunting werewolves, I recommend stuffing the muzzle down his throat. That should do the trick.