I loaded the 125 gr. Sierra Spitzer in '06 and .308 Win. for my Dad towards the end of his hunting days due to less recoil for him. He smoked a lot of deer with that bullet, and he dropped a nice 7 pt. over 200 yds. with one shot. It folded up like an accordian.
Do I consider it to be a great whitetail bullet? Not really. The BC and SD are not the best for either of those calibers when it comes to that type of hunting. But it worked for my Dad and his needs. It was more of a "specialty" load for a given situation. Accuracy-wise, it shot really well in both of the aforementioned guns, and was a pleasure to shoot for sure. JFWIW......