Wayne,
Love your book "Deer Rifles and Cartridges".....

I was reading in a old issue of the American Rifleman, Nov. 1965, an article written by Les Bowman, titled... "Game shooting at Long Range"

Under the subheading "Selecting the proper Bullet".....listing certain calibers, he mentioned about the 270 in particular...... the 150 grain bullet, "while they leave the gun at lower velocities then lighter weight bullets do, in most cases they exceed them in velocity after the first 200 yards, and at long ranges are far ahead both in velocity and energy"

What say you?

Ralph