I only shoot 1-2x a year so I have to make the best with the time I have.
Let me try this one more time guy- Harder isn't better! Harder is just different. Sometimes harder is worse for what you want to do than softer. I would put money down that 95% of the shooters out there could do 95% of their handgun shooting with a tertiary alloy with a Bhn between 13 and 16 bhn. You say you want to make "the best", yet the only way to determine what is "best" is to shoot and see. There is no crystal ball that will say that absolutely must have a Bhn of, say, 20, to get a given gun shooting good with a particular load. You don't say what gun, what load, what bullet, what size, what treatment, what range, what velocity range, what cartridge or ID the "what" of dozens of other variables. You just say, "I have to make the best...". Look guy, there is no "best" in this game. I can give you 3-5 different Bhn readings from the same alloy easily. Or the same Bhn from 3 different alloys. I'm not trying to be a prick, but you're chasing a unicorn. If you want to have "the best", then you are going to have to shoot what you have and then work on FIT, not Bhn. It's FIT that gives you "the best", not Bhn. Bhn is a secondary PART of FIT. You appear to have bought into the Bhn cult hook, line and sinker. If you truly think that's the answer, then take your alloy, cast your bullets and water quench them. That will give you the max hardness you can easily achieve. Then load them up and shoot them. If the gods of lead smile on you, it will all come together and you'll have bug hole groups at a gazillion fps. If not, and that's likely, then you can start learning about FIT because FIT is what makes bullets shoot good, be they soft, hard or in between- not Bhn.
Again, I'm not trying to be a jerk, but I went through the same phase (I drank the Bhn Koolaid by the gallon!!) and I've seen literally hundreds of other people go through the same thing. I'm trying to save you a little time and effort. FIT is KING. Bhn does not equal fit.
Maybe someone can provide a link to the discussion on just what fit is. I couldn't find it.