Originally Posted By: Stan
'Splain to me once again how holding an acetylene torch flame to spots on a doublegun action case hardens it. It horribly colors it, but you now claim it case-hardens it?

SRH

Well, as you already know, what is happening there is a tempering.
Those colours are the varying hardness as the hardness is drawn out of the steel.

Hardness colours are over rated anyhow, IMHO.
I have a NEF 410 that is like a Christmas tree bauble.
Garish as a rat with a gold tooth.
O.M