Up until now I have been air cooling my boolits but with a new to me pistol I decided to vary the BHN upwards a little by water quenching instead of increasing the alloy as my pot was full of 20:1 just to see what it would do.
I started with 20:1 alloy which yielded 10-10.5 BHN with my other boolits. I heated the alloy to 675, cast and then dropped them into room temperature water. After letting them harden for 24hrs I tested them and came out with 14 BHN. From reading the threads on water quenching I was expecting more in the neighborhood of 18-20 BHN.
Does this sound right? An increase of only 4 BHN? This is fine with me as it approaches Lyman #2 and is a good place to start for me anyways but I find this curious