If you can do the 30-30 and 30-40 krag then the 7BR NS die then it might work with 303 savage, not sure about the 300 savage. The 7BR has a 30 degree neck angle. 30-06 has 17.5 degree, 30-30 has about 15.4, Krag has 21.6. The 303 savage is 16 degree, and the 300 savage is 30 degree. The 30BR...