I gave it a try, essentially I found the problem to be if i put the werewolf body temperature up, they melt, if I put it too far down, they freeze, so when I move the silver temperatures to match the werewolves, I cant make the bullets not boil when out in the open (Oddly enough, if I do two lots of arena combat, ie, 5 humans v 5 werewolves, see result, do test again, the second time around the silver boils, but the first time it does not) and when I can get the humans to fire bullets at the werewolves without them boiling beforehand, they seem to hit like normal bullets, and don't appear to boil inside the body (if they do, it doesn't appear to do damage or get mentioned in the combat logs) Thus I find myself stumped, I can get the bullets to survive half the time and hit the werewolf, where they don't boil, i can get the bullets to survive all the time, but then they have a boiling temperature higher than the werewolves body temperature, if I up the werewolves temperature to meet that, they melt instantly.
Thus I admit defeat at this challenge I decided to look at in my boredom, I assume it is entirely possible, if one can make the werewolf withstand a higher body temperature, as I see other creatures that can have a far higher temperature, it is however outside my limited skill in the subject of modding.
tl;dr Couldn't quite get it to work, requires someone who knows more than me, which cant be that hard.
edit : ah, i thought I'd lost this post somehow, anyway, i also tried adding a syndrome to the silver, and now silver fails to appear in the lists for anything, so i do truly give up now >.>