I would leave it a 300 WIN MAG. Shoot 215 Berger's out of it and blow the 257 and 264 away. Get a 9 twist or even a 8.5 and you can shoot the heaviest for caliber bullets out right now. Don't think the twist rate for the new Berger 245 gr has been released yet. But if deciding only between the 257 and 264, I would go 264 all day long. Better bullet selection and will deliver WAY more energy on the long distance shots. I have a 25-06 AI which gets me very close to 257 Weatherby speeds. 115 Berger at 3350 fps. But because the 115 is so light the energy just drops off so fast. But at 500 yards will work on wolf to deer size game no problem. Again if going with either research your twist rate on your new barrel so you are not limited on what bullet you can shoot.




















































