probably needs some edumacation?

[Reed]

Hasn't anyone read Dennis Marshall's articles on heat treatment in the NRA's "Cast Bullets," Lyman's "Cast Bullet Handbk., 3rd. Ed.," and or RCBS' "Cast Bullets, Vol. I"?

I've read his discussion in NRA's Cast Bullets. It's interesting to me that his results show with a temperature of 446 or above, there was no gain in hardness with heat times beyond a 1/2 hour. Of course he controlled his conditions far better than the guy in the video, who had no idea how much heat he was using. Marshall's test alloy contained 5% antimony, 0.5% tin, and 0.17% arsenic. It's anyone's guess what a given batch of WW might contain. That probably explains why I've seen so many recommendations to heat for an hour.

 

[Brad]

What many don't understand about heat treating is that we can use it to control hardness. No need to go for maximum hardness in most situations.
Try heat treating at a variety of temps in 25° increments and see what your alloy does.
I find that heating to 400° does what I want the majority of the time.

 

[Maven]

All, After watching a few minutes of the video, which was sorta like watching paint dry, I thought the guy hadn't mastered the subject (HT) or how to go about it. That's why I asked about Dennis Marshall's work.

 

[Rick]

I haven't read the Marshall article in several years. The percentage of Sb control's the final BHN that can be achieved AND how fast it will get there. Higher percentages of Sn (5%+) reduces both BHN and the time curve.

 

[freebullet]

Well, even blind mice find cheese sometimes.