Good shooting
I am working on necking up my 300 ultra to 338
and am going to shoot Bergers new .338 300gr hybrid
My hunting buddy built one when the the 300 RUM first came out. I was impressed with the cartridge and it's performance then. It has the same case capacity as the 338 Lapua so the ballistic is the same. I'm waiting for Berger to iron out some of the kinks on the the design of their 300 grain. From what I heard, people are not happy with the accuracy of the bullet downrange. So far, I'm satisfied with the performance of both the 250 and the 300 SMK in my rifle.