It boils down to 5 to 6 grains of powder and the plus goes to the 300 win mag. That's for those that reload. And for those that reload know what 5 grains of powder willadd to the velocity. About a difference of 100 to 150fps. Put that in your short mag case and you got problems. I'm not knocking them I just think its something new for them to sell without any advantage in actual ballistics changes. Everyone is looking for the greener grass and they are making tons of money off these ones.