My brother got a 300 WSM, he likes it, I am not real impressed. The ammo is still too pricey for what you get. His is a Winchester M70, I think it only has a 22" well it has to be a 24" barrel? Im not sure it feels short but all my rifles have 26" barrels with an extra 1.5" for a break so they are looong. But my old 300 Winchester with a 26" barrel seems to actually have less drop with similar factory ammo. I once read an article on the ballistics of the 300 WSM that made it look great but when I really looked it said the test barrel was 26" and I have never seen a 300 WSM with that long of a barrel. I think that may explain why my brothers does not seem to shoot as the hype leads you to believe.
I do know of people who swear by them, but I have only shot one, and I admit the gun is lighter but thats all I noticed.
But as my name implies I love my 300 Ultra and many people say alot of bad things about it. But as for me I will keep my 300 RUM
