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Discussion Starter #1
I'm a big fan of plated bullets, but I do load cast also. I've never really had a problem with leading, just been lucky I guess. I'm planning to load some cast soon so I thought I'd check out MBC's "Hardness-Optimized" equation. I must have Brain Lock on it tho. I've read it several times but must be missing something or am just stoopid. Anywho what I can't figger out is they first list it as BHN=Cups/(1422*.90) then Cups/1279.8=BHN. Why the different divisors?

If I'm being an idiot, please feel free to call me names as long as you give me the answer! :?

It's really pointless as the bullets I plan to load are 24 BHN but I would like to know how to figger this if I need to someday.
 

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I have read Iowegan's posts on this numerous times and still have no idea. :|
 

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Discussion Starter #3
It would seem to my very pickled brain that the divisor should be a constant. If not then where the hell do you get it? :? :? :?
 

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Discussion Starter #4
Well I ran the math backwards both ways, at BHN-24 multiplied by 1279.8= 30,715Cups, 1422.9= 34,149Cups. Now I'm down to the other question thats allways bothered me. How do you know how many CUPS your gun will handle? I know SAAMI sets limits by caliber/bullet but what if you want to use a bullet with BHN-24 & avoid leading? I don't worry about it when I load for my Rugers but I'm planning to load some for my 1911 & a S&W revolver. I would think I should keep my 1911 loads below 20,000CUPS if I do am I going to have a leading problem?

And another thing, some of the loads I looked up were rated in PSI so now I'm really cornfused! :?
 

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This is from Iowegan. He posted this in my thread on 45 Colt loads.

Bullet hardness is measured in "Brinell Hardness Number" (BHN) where a low number indicates a softer alloy. Someone came up with a formula for obturation that works well for all revolvers in all calibers when lead bullets are used. It is: BHN = Chamber pressure divided by 1440. If you know the bullet hardness and need to know chamber pressure ... Chamber pressure = BHN times 1400. The max powder charges for standard loads will run very close to 14,000 psi. In "Ruger Only" load charts, the high end powder charges produce about 25,000 psi.
I don't know how much help this is to you.
 

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i've been flyin' blind a lot of years not knowin' this info and gettin' by on trial and error.......
 

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Discussion Starter #7
Thanks Bounty thats what I'll go by. I know what Deputy is talking about, I've been in the same boat myself. I'm also thinking that if I have a choice between a hard & soft bullet I'll go with the hard bullet just because thats what I've loaded in the past with very little leading problems.

I'm going to get me one of those Lee hardness testers For when I start casting my own bullets. I guess from reading the Lee catalog they have a conversion chart that tells you the CUP for your bullet.
 

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Deadeye said:
I'm a big fan of plated bullets, but I do load cast also. I've never really had a problem with leading, just been lucky I guess. I'm planning to load some cast soon so I thought I'd check out MBC's "Hardness-Optimized" equation. I must have Brain Lock on it tho. I've read it several times but must be missing something or am just stoopid. Anywho what I can't figger out is they first list it as BHN=Cups/(1422*.90) then Cups/1279.8=BHN. Why the different divisors?

If I'm being an idiot, please feel free to call me names as long as you give me the answer! :?

It's really pointless as the bullets I plan to load are 24 BHN but I would like to know how to figger this if I need to someday.
I may be misunderstanding the question, but 1422*.90 = 1279.8......doesn't matter which method you use.....
 

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Deadeye said:
Well I ran the math backwards both ways, at BHN-24 multiplied by 1279.8= 30,715Cups, 1422.9= 34,149Cups. :?
Deadeye, your calculation is wrong......it is not 1422.9....it is 1422 * .90......which equals 1279.8.....
 

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There is a chapter or two on matching bullet to chamber pressure, etc in Richard Lees- Modern Reloading second edition. It may help.
 

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Discussion Starter #11
Ok Wiz, your going to have to explain it to my dumbass what the * means. Just pretend your explain'n it to your 5yr. old. Maybe it'll sink in to the concrete in my head then! :?
 

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The * is a sign that means multiply....in other words, 1422 * .90 = 1279.8....

1422 * .90 = is the same as 1422 X .90 =


....
 

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Discussion Starter #13
Why in the Hell do they have to be so F&[email protected]#^g difficult! :evil:
I never understood that Pie R Square thing either, my mom always told me Pie R Round, Cornbread R Square! ;)

I got to thinking about this whole thing last night & it seems to me that unless your load data is for the exact gun, barrel length, primer etc. its kind of pointless anyway. :?

Thanks fer stratnin out my cypherin anywho! Things are gett'n so fer beyond my edgecasun now days! I thought I was good with just bee'n able to do my guzintas but now I gotta relearn it all becuz some eggheads want to be diffycult! I knew I shuda give'm Danebramage back when I wuz tak'n there lunch muny back in grammer scool! :p
 

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That is the symbol is used in spreadsheets for multiplication. 5*5=25. That tells the spreadsheet program to multiply the two numbers and that has morphed into internet symbols when showing two numbers to multiply in an explanation.
 

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heck, 5+5+5+5+5 IS SO MUCH EASIER.....(I just gotta borrow someone else's paw...)
 

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Just a small point here from me I have found that I can load more and shoot more if I buy the bullets already made, and for me its much cheaper also.
 

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Terry_P said:
That is the symbol is used in spreadsheets for multiplication. 5*5=25. That tells the spreadsheet program to multiply the two numbers and that has morphed into internet symbols when showing two numbers to multiply in an explanation.

i'm still on the 5x5=25 myself...............

don't guess i speak the computer lingo too well............
 

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Discussion Starter #18
Terry_P said:
That is the symbol is used in spreadsheets for multiplication. 5*5=25. That tells the spreadsheet program to multiply the two numbers and that has morphed into internet symbols when showing two numbers to multiply in an explanation.
Its still the fault of the Eggheads! If * is for spreadsheets then they should leave it on the damn spreadsheets & give us X! That MBC webpage is not a spreadsheet!!!

Maybe we could still find one & take his lunch money! It would make us feel better anywho! :twisted:

P.S. Thanks guys for all the info!
 

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This thread is funny..... :D As most of you know, before retiring, I was a computer systems manager at a VA medical center here in Florida....prior to that, I was a computer programmer....guess I never gave the "*" a second thought....just always used the asterick as the multiplication sign when writing code...but I guess it does come from spreadsheets....but then, I think we also used it back in highschool.....hard to remember back that far....anyways, everyone always thinks that computer programmers a strange, and seem to think differently from everyone else.... :eek: ....well, they are totally right....we do think differently, because in programming, everything can be boiled to to an absolute.....in other words, IF THIS, THEN THAT. Everything causes a result, and every result has a cause.....

And since I'm really showing my nerd side, there are only two states of a computer.....it is either transmitting an electrical impulse of it's not....i.e., it's either on or it's off. So, everything you do at the keyboard does nothing more than transmits an eletrical impulse, or it doesn't.....see, computers are easy to understand..... :lol: :lol: :ugeek: :lol: :lol: :lol:
 
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