I don't have a NEF .30-30, but I have a Marlin .30-30 that will print the 170 gr. Cor-lockts exactly 1 inch lower at 75 yards than the 150 gr. Cor-lockts. The deer I shot with the 150 gr, I found the bullet on the back side of the hide, and it was a perfect mushroom. My father in-law has an NEF .30-30, and he swears by the blue box Federals in it. Honestly, I think it's the only ammo he has shot through it.