Heat treating then powder coating

[Shuz]

If you heat treat a bullet and then powder coat it at 400 degrees and slowly let the bullet cool, is the hardness that was obtained by heat treating reduced?

[Luke-299]

Yes! But you can harden PCed bullets when you drop them in cold water.
Here an article about heat treating. I PC for 20 min at 200°Celsius and drop them in water. My alloy hardens to 25 after a few weeks.
http://www.lasc.us/heattreat.htm

[popper]

Molecules move around in a solid metal, higher temp, more movement. It takes time at temp to get them arraigned right. Temperature of quenching water determines the rate (faster is better) of cooling and resultant hardness.
I cook my PCd bullets for one hour @ 400 F then into ice water for highest BHN. Alloy, time and temp determine the BHN.

[Budzilla 19]

PC’ed Rifle slugs get one hour at 420*F, then quenched in ice water, PC’ed pistol slugs 30 minutes, no quenching, no leading so far!!
Air cooled cast rifle slugs, then size and gas check,powder coat, then size and load after two weeks of resting time.
No leading in 308 win. At 2600+ FPS
Just my opinion and results

Alloy is 50/50 ww/ pure with 2% tin.