The 62s that I actually shoot seem to vary some in the BH they like. I have one in the range of 8.25" and another down around 7.75". Go figure.
Handshock? That has to be the first time I've heard that term mentioned during a discussion of 62 Kodiaks.
I'm at a loss as to what could cause handshock in one. Keep us informed if you find the source or cause.