If my math is right, you should be able to get roughly 30% more range out of your flash by using the faster film. That's assuming that the flash is firing at peak output.

I don't have a game cam(yet), so I don't know too much about them. If you're seeing pics with animals slightly out of flash range then you could benefit from the faster film. On the other hand, if the camera only fires when the animals are within flash range, then you really don't need the faster film. The only advantage it offers is that the camera will work without a flash under slightly lower light levels. The disadvantages are higher film cost, and grainier pics.

-Matt