Performance on game is excellent, even overkill for Your application. And more expense than needed, in this case, but since You already have them, it is a mute point.

I had great hopes for NPT's, and have several boxes setting around, but I can never get the accuracy from them that I get from other hunting bullets. The accuracy is plenty good enough for hunting, but I just can't bring myself to use a less accurate pill, especially when that much terminal performance is not necessary.

With a pill that light, from Your WSM, at the distance mentioned, shooting a White Tail, there will be some serious blood shot meat, if not worse.