BHN Numbers

[Krh1326]

I have seen and tried to use several of the alloy calculators that are available, and have been having success , getting my cast boolits at the BHN that is appropriate, for its application. Usually involves ciphering thru %s or different units of measurement for a particular type of alloy.

It dawned on me, that maybe there is a simpler way? Maybe that’s wishful thinking… IDK, that’s why I’m asking….

Is there any kind of scientific, or mathematical formula, or ratio sentence that could just work with an alloy’s tested BHN number?

For example: If I have 8 ounces, of Alloy L ( unknown actual pb/sn/sb content ) that tests to 18 BHN, how many ounces of Alloy P ( unknown actual pb/sn/sb content ) that tests to 8 BHN, would I need to create Alloy M that tests to 12 BHN ?

Sure would be nice to try to plot that kind of data on an X / Y kind of chart, for plug and play BHN numbers. I wonder if it would plot a straight line or a curve….

I do not have a college education, but I’m trying to reason it out, and I find myself trying to write formulas, like this….

8 ( ozs ) x 18 ( BHN ) = 144
144 / 8 (BHN ) = 18 ( ozs ) ?

So…. Would 8ozs of 18 BHN + 18 ozs of 8 BHN = 26 ozs of 12 BHN?
No that can’t be right, how would the formula know, you’re looking for 12 BHN….?

8 ( ozs ) x 18 ( BHN ) = 144
144/ 12 ( desired BHN ) = 12 ( ozs ) ?

So … would 8 ozs of 18 BHN + 12 ozs of 8 BHN = 20 ozs of 12 BHN ?
I think no again, as how would formula know you’re adding 8 BHN alloy.

[OS OK]

I've tried this method before, first saw it on the Y-Tube. It's not very accurate at all, I get better results guessing with Bumpo's Calculator.

https://i.imgur.com/9vH0xk4.jpg

There's no short cut I can think of where you get an accurate result from using components that we don't know the composition of.

[charlie b]

http://www.lasc.us/CastBulletNotes.htm

Go down a bit and there is more about alloys than you'd ever need to know.

[Krh1326]

Ah Haaaa

I’ve found this, and it’s very close to what I’m trying to figure.
Now how can I substitute known BHNs to find an unknown amount?

308761

[Krh1326]

I've tried this method before, first saw it on the Y-Tube. It's not very accurate at all, I get better results guessing with Bumpo's Calculator.

https://i.imgur.com/9vH0xk4.jpg

There's no short cut I can think of where you get an accurate result from using components that we don't know the composition of.

I found that, in a thread, that you are in, as well.

308764

https://castboolits.gunloads.com/showthread.php?313917-Lead-BHN-Calculator-based-on-known-BHN

[OS OK]

I found that, in a thread, that you are in, as well.

308764

https://castboolits.gunloads.com/showthread.php?313917-Lead-BHN-Calculator-based-on-known-BHN

For a couple years I was into casting HP's with what I call 'Poor Boy's Reclaimed Lead' ... lead that we only know by what it was used for, as in...roof flashing, X-ray lead shielding, isotope lead and of course, good'ole WW's and SOWW's. It was quite the journey, even had Eric at Hollow Point Moulds make me some special 3 sided and 4 sided HP's similar to the Penta.
One of the most enjoyable times I've had in this Brass Stuffing Hobby we all share.

[Krh1326]

For a couple years I was into casting HP's with what I call 'Poor Boy's Reclaimed Lead' ... lead that we only know by what it was used for, as in...roof flashing, X-ray lead shielding, isotope lead and of course, good'ole WW's and SOWW's. It was quite the journey, even had Eric at Hollow Point Moulds make me some special 3 sided and 4 sided HP's similar to the Penta.
One of the most enjoyable times I've had in this Brass Stuffing Hobby we all share.

I am a HUGE fan of HP Truncated Cones. I have .45acp and .40 sw HP truncated cones, from Eric. I begged him to make a 9mm HPTC…. Says it’s too small. I had to get the 9mm HPTC from NOE. Nice mold, but I don’t care for the pin config…. Love Eric’s

[JonB_in_Glencoe]

SNIP>>>

Sure would be nice to try to plot that kind of data on an X / Y kind of chart, for plug and play BHN numbers. I wonder if it would plot a straight line or a curve….


It won't be straight
It won't be Curved
It can't be X / Y
There are too many factors.

Maybe reading this will help?
http://www.lasc.us/Fryxell_Book_Chapter_3_alloySelectionMetallurgy.ht m

[Krh1326]

I thank you, for pointing me to that site…. Time to get a cup of coffee, and dive in…