Let's assume he had a 1350 fps load, 600 yards would be 55 foot or so holdover, not even trying to factor any wind drift.
I am assuming you calculated these results at sea level, because using the approximate atmospheric conditions around Salmon for that time of year gets 47-50', using a sight-height of 1" above the bore.
Yea, since I wasn't there it would be a little difficult to know the exact conditions. I figured an approximation was close enough. What's 5-8 foot when you're talking about 50 feet of holdover. I wonder how he could figure that on the sight blade of a 6 inch gun? I'm thinking he probably didn't have a NF mounted on it. 😂
