Johnny never said. He was asked and didnt respond.
I see no mystery. The bullets went under the target in a 2' group.
Funny story, that I probably posted about years ago.
When I first shot the Pre-64 Mod 70 (30-06), it shot 2' low at 100 yd, group size unknown, LOL.
It came equipped with iron sights only. Before I shot it, I mounted a scope on it, and bore sighted it at home. I go to the range, and I can't hit the target, until I move up the the 20 yard line.
Turns out that the original stock of this Mod 70 had a rubber thingy in the channel of the wood, pushing on the barrel.