For me, the .35cal 200gr has a SD of .223 compared to the .30cal 200gr of .301, makes the two not very comparable. Given bullets of similar construction are used in both, the 300 will outpenetrate the Whelen, probably by a sizeable margin. Not to mention the added long range potential of the 300 Win Mag that simply isn't there with the Whelen. Neither is my choice, but of the two, would select the 300 for being a better all around cartridge, being able to handle everything the Whelen can, plus more.
