Waco
Actually it wasn't that much "uphill". It was less than 3 degrees uphill from the 600 yard shooting position to the target. The 1st picture in my post was taken at the base of the hill less than 50 yards horizontal distance from the target. From the shooting position at 600 yards it also is a slight decline to the base of that hill as seen in the 2nd picture. Have to admit it's easier getting down into a prone position than getting up anymore. Also I've learned to take a bit higher position by using a higher front rest and rear sand bag. If you enlarger the 4th picture you'll see the 2 boards under the rear sand bag to raise it up. Thus I've learned to get into as comfortable yet stable position as I can.
Even then I try not to stay in position "on the rifle" too long. I lay a bit on my side relieving the strain on the neck between shots while letting the barrel cool. Even then I don't stay down in position much longer than 20 minutes any more. Appreciate the concern.