Mike,
Simply get a used toaster oven at a tag sale and have at it. I use one all the time for heat treating. I hang an oven thermometer in it and run it to max at about 460 degrees with my alloy for about a half hour then dumping them into a 5 gallon pail of cool water. Over night set on a old towel to dry.
I get about 24-26 BHN with regular WW alloy.
If the bullets slump with your alloy, lower the temp until they don't.
When you are done, put the toaster oven away and don't lick the inside of it.

I use the aluminum tray that came with it to set the bullets on in lots as big as 200 bullets.
You can then "draw" the bullets to whatever hardness you want through experimentation down to the original alloy hardness.
Regards