I had the gun sighted dead on at 200 yards, which I never checked the zero at 50 yards.
I figure that it was 1 - 1/2 high at 100 yards. Other than that, I figure that it was probably 3 inches low at 300 yards. Which makes it a pretty good tack driver.
My easiest explanation would be that when you sight in a gun on a level shooting range and then try to shoot it at an up hill or down hill target, the point of aim changes some - just like wind drift.
The same as sighting in on a padded bag and then shooting off a fence rail out in a farmers field.
My situation was that the deer was on the side of a hill, aprox. 50 yards or so above me and I was standing on a road - shooting up hill. The doe was looking at me at the time and I aimed between a couple of pine trees where I saw an opening. There was aprox. 5 or so deer in the area and I only wanted to shoot one. The only shot I had was in the neck area or along side of the deer - a quartering shot.
I think that I aimed just below it's chin and I hit it in the backbone. High - but dead center.
Did it move it's head or did it start to run when I shot or did I hit a different deer than the one that I was aiming at? I can't say for sure because it all happened so fast. I was waiting for my brother to shoot first and then I was going to take my shot. But he said that his scope was fogged up - Leupold, and couldn't shoot.
I shot and a doe went down.
But that was the first time in my life I ever shot a deer and never hit the vitals and killed it instantly.
It never hit the backbone, but blew all the meat off the top of the backbone, just in one area about the size of a softball.
A 30/06 probably wouldn't have killed it with the same effect as the .270 WSM did.
In my opinion, it just isn't suitable for shots under 100 yards because of all the power that the bullet has with that gun. The nearest thing that I could compare it to would be my 300 Weatherby Magnum - which sounds like the Rifleman when you shoot it. Not a bang! But a Wheew.