I remember he recommended sighting in 3 inches high at 100 yards to maximize point blank range. I did for years until I realized 100 was about the maximum range I could shoot.
I first embraced that same piece of JOC's advice circa 1967 and continue to use it for the majority of my deer hunting rifle 50 years later. Despite the improvements in technology that we've seen since JOC shared the bit of advice, it has stood the test of time and is as valid today and it was when he first offered it for the vast majority of the average North American deer hunters.
I believe my Dad used the same JOC advice and passed it on to me and I used it until I read a piece in Rifle magazine by our Mule Deer. Now I take my Bourbon three fingers (3") high in a glass and use the following numbers for my hunting rifles
Initial sight in to get on the paper - 35 yards.
"Woods" range - sight in @ 50 yards = 1 inch high @ 100 yards and 1 inch low @ 200 yards.
"Open Country" range - sight in 1 inch high @ 50 yards = 2 - 2.5 inches high @ 100 yards
