Golly Geez....a 300 win. magnum for Whitetail?? A bit overkill....no Pun intended. I have hunted Whitetail for 40 years in New England.....used to be a 30 30, then a 300 Savage, and now a .308. Everything I ever shot was with a 150 grain bullet. For me personally the .300 savage, with a muzzle velocity of say 2400 fps, and knock down energy at 100 yards is about 1850 ft-lbs. Is was, the Best. I would think most whitetail hunters will agree the 3 caliber that I have used are more than sufficient for a northeast Whitetail kill. Save your shoulder and some meat....use a lighter caliber. Just my opinion .
Its a well known fact that those massive Virginia Whitetails are dangerous game and have been known to charge when wounded by lesser calibers - take the big gun
Actually I have found the 300 WSM to be just fine on game as small as Pronghorn - I use the 180 gr Nosler Accubond and they really don't tear up the animal any worse than a 'mild' round like my .257 Roberts (doesn't kill them any deader either) . Just shoot em in the chest and it will be quick and clean.