You can get factory ammunition in both 300Win and 35Whelen with 200gr bullets that are running 2900fps+. So if shots were 300yds and under why would anyone choose a 300Win over a 35Whelen?
Because a 200 gr bullet in a 300 mag is a moose/elk/grizzly bullet and a 200 grainer in a 35 whelen is a deer bullet.......