Why on earth would anyone need to heat treat linotype with a BHN of 22? But again, arsenic is not necessary for heat treatment.
Don
Do Berry's have a BHN of 22?
Well, my results are in:
I waited about 4 hours and then took a small sharp tip Philips head screwdriver and put all my weight on it for 5 seconds and here's the results.
The one on the right went pretty deep and the one on the left barely got past the copper plating. It definitely quench hardened. How much more, I don't know but I am sure it hardened.
There are many reasons why one may want a softer bullet or a harder bullet. My purpose for hardening is to get better penetration. I'll have to drop my 10mm load back down though and work back up with the heat treated bullets.
I was getting pretty good accuracy with the bullets the way they were so I'll have to see if I get the same velocity and accuracy with them heat treated.