RE: sierra gameking's on deer.
I used to be a Sierra Gameking shooter, but than switched to ballistic Tips for deer. I think either bullet will perform well on deer sized animals, as long as it's put in the right spot. Just my guns grouped much better with Nosler Ballistic Tips. Our bucks aren't little, many tip the scale on the hoof at the 200 plus range. The ballistic tip puts the spins on them in a right hurry, as does Seirra's.
I don't see any problems, just shoot what your gun likes best and works for the situation your in. I pick the boatails variety, b/c they work best for my hunting situation and just widdled it down to what shot best out of my guns.