I learned the lesson of not blending everything ya have into one alloy many years ago. When things change and they will, a new caliber or whatever and you want to blend a new alloy or just use some of that soft that you "had" you can't, everything went into the one alloy and that's what ya got. Experimenting is great but all your eggs in one basket isn't.
I shoot the largest diameter bullets that will chamber, generally I take 5 fired unsized cases and measure the inside diameter and go up or down from there.Any tin or pewter? Some fellows may want to know that.
Have you checked bore size, pound casted or measured any of your throats in any way?
I am going to refrain from an answer, because there are a lot of variables here to consider. And I am fairly green. I could probably lead you to the right path but the more experienced fellows can get you when you want to go quicker.
Also what powder(s) do you have? Alloys act differently with different powders.
There are a lot of fellows here that have been thru the mill With 30 ish calibers, over 1800 fps. Way more then me.
Ok I said I would not give an answer, but, my two cents. Mix it all together and add 4 kg of pewter, or tin. Or 8 kg of 50/50 solder.
That will put it some where in the workable zone. Then figure out how to make it work for your rifles.
Having 155 kg of one consistent alloy, will get you a pretty far.
I have estimated chamber size by measuring fired cases and measured barrel size by pushing a slug thru. It worked well for most stuff.I shoot the largest diameter bullets that will chamber, generally I take 5 fired unsized cases and measure the inside diameter and go up or down from there.
For you, I would omit the sheet lead and most all of that tin. Then Mix the remainder into one alloy.I'm in a similar boat. I have 400lbs of unprocessed indoor range lead. About 150lbs of CWW, 75 lbs of Lino, 75 lbs of pure sheet lead, a couple dozen lbs of pewter and smaller batches of other random hardish lead alloys.
My plan is to mix as much of it as I can together so I can have a large batch (for my purposes, possibly a lifetime batch) of 2.5%Sb, 1.5%Sn, 96Pb. A large consistent batch will allow me to make or shoot anything in the future. I probably won't have to tweak anything unless I get into some nerdy super science project.
Then when I'm all done with the very large batch, I'll send it off somewhere for testing so I know as best as possible what I am dealing with and how close I am to what I expected.
Just remember that Bhn is only a small part of the story. Please don't get hung up on a relative number as indicating anything truly useful. It's useful in general terms and there it ends.An update, I have done a trial smelt with equal 2kg amounts of of hardball range alloy, COWW and sheet lead (flashing) and another with just 2kg of range alloy and COWW to get an idea what I have, I'll do some BHN testing after a week.
I'm just concerned that the extra lead in the melt will dilute the mix too much to the soft side, it's a waste having tin and antinomy in good qualities then soften it by adding too much lead.
Ian, it looks like that case has a crack in the shoulder/body area.