Author Topic: Conversion factor of 1,422  (Read 753 times)

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Offline Jim 44-40

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Conversion factor of 1,422
« on: May 25, 2005, 01:17:31 PM »
Need some help! If I have a load with 11,400 Pressure C.U.P   Should the BHN be 8 ? Thanks in advance

Offline BCB

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Conversion factor of 1,422
« Reply #1 on: May 26, 2005, 08:26:02 AM »
Jim 44-40,

I believe that conversion number works for P.S.I. not C.U.P.  Ain't sure though, but BHN of 8 can surely handle 11400 C.U.P. I feel certain.   Good-luck...BCB

Offline LAH

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Conversion factor of 1,422
« Reply #2 on: May 27, 2005, 02:21:12 AM »
If you do 1422X8=11,376 then you certainly want nothing harder than 8 BHN for your load and perhaps somehting a little softer would be better.
Joshua 1:9

Offline Jim 44-40

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cup / psi
« Reply #3 on: May 28, 2005, 04:59:42 AM »
Thanks guys, had time to do some math. To change C.U.P to Psi take Cup x 1.516 + cup=(____)-17,902=Psi .

Offline TennesseeNuc

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Conversion factor of 1,422
« Reply #4 on: May 29, 2005, 04:37:07 PM »
Can someone explain the use of 1,422 as a conversion factor?  I think it has to do with the bullets ability to upset and fill the bore, but I don't know how to use it.
Thanks,
TnNuc

Offline BCB

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Conversion factor of 1,422
« Reply #5 on: May 30, 2005, 01:51:09 AM »
TennesseeNuc,

You are indeed correct that the conversion number has to do with the bullet obturating, that is, the base being "smashed" to fill the rifling fully and allow for a good seal as the bullets travels the barrel.  An example of its use is:  Pretend you cast a bullet of BHN 10.  You multiply that times the conversion factor and you get 14220 P.S.I. to obturate the bullet.  If you are shooting a reload that produces 12000 P.S.I. the bullet may not obturate.  If you are shoot a reload that produces 15000 P.S.I. the bullet, in theory, will obturate.  
I think this is just a guide and not an absolute.  Good-luck...BCB

Offline TennesseeNuc

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Conversion factor of 1,422
« Reply #6 on: May 30, 2005, 04:50:42 PM »
BCB,
Thanks for the info.  I'll make a note and keep it in mind while casting and loading.  If I don't write it down I'll forget it. :?
Best,
TnNuc

Online Graybeard

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Conversion factor of 1,422
« Reply #7 on: May 30, 2005, 05:07:43 PM »
Quote
Thanks guys, had time to do some math. To change C.U.P to Psi take Cup x 1.516 + cup=(____)-17,902=Psi .



Wrong oh! There is no such thing as a converstion factor. There is just no true relationship between the two means of measuring pressure. Some times CUP is higher than PSI for the same load and cartridge. At other times it's the other way around. Other times still they are almost identical. It varies too much to try to state any fixed relationship cuz there is not fixed relationship between them.


Bill aka the Graybeard
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Offline Smokin Joe

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Conversion
« Reply #8 on: May 30, 2005, 06:06:05 PM »
I agree with the Boss, where in the heck did you find that conversion factor? There's a big difference in measuring the length of a copper crusher slug and reading PSI from a strain gauge. I think you can toss the formula.........the sooner the better.
Deo duce, ferro comitante
With God as my leader and my sword as my companion

Offline Jim 44-40

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cup/psi
« Reply #9 on: May 31, 2005, 01:51:16 AM »
From ShootingSoftware.com

Online Graybeard

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Conversion factor of 1,422
« Reply #10 on: May 31, 2005, 02:00:05 AM »
Quote
From ShootingSoftware.com


Then that's as good a reason as I can think of to not spend anymore money there or to believe anything else they tell you.


Bill aka the Graybeard
President, Graybeard Outdoor Enterprises
256-435-1125

I am not a lawyer and do not give legal advice.

Jesus is the way, the truth, and the life anyone who believes in Him will have everlasting life!