There is not much gain over the 300 RUM in velocity is there? According to my manuals from 50 to 100 fps seems to be the average. My Sierra manual shows a 50 fps difference in the 220 grain bullets at the cost of 10 more grains of powder. With the 200 grain bullets in only gains 200 fps over the 300 Win mag at the cost of 35 grains more powder. Not very efficient use of powder it seems to me. Interesting thouigh.