THE ACCURATERELOADING.COM FORUMS


Moderators: Mark
Go
New
Find
Notify
Tools
Reply
  
c.u.p vs psi.
 Login/Join
 
<jim k>
posted
What is the preasure difference between c.u.p. and psi. TNX
Jim
 
Reply With Quote
<bobshawn>
posted
jim k __

CUP values vary sufficiently above, at, or below the more accurate PSI values that there is no honest mathematical method of comparison. When the occasion demands, like for a structural analysis of a firearm, I simply multiply CUP numbers by 1.17 to get me reasonably closer to a PSI number. The result is conservatively higher than the probable real value. I'm not advocating this method. It's still a "more than likely" guess.

Good shooting.

Robert

 
Reply With Quote
<jim k>
posted
Tnx Robert.
Jim
 
Reply With Quote
<PowderBurns>
posted
CUP relies on crushing a copper pellet in a specially made barrel setup. While the pellet is as uniform as possible, copper doesn't crush in a "straight line" (on a graph). Accordingly, higher CUP pressures cause the copper pellet to compress more tightly and reading precise variations in this compression become more and more exacting.

------------------
PowderBurns Black Powder / Muzzle Loading Forum:

www.hotboards.com/plus/plus.mirage?who=powderburns

 
Reply With Quote
  Powered by Social Strata  
 


Copyright December 1997-2023 Accuratereloading.com


Visit our on-line store for AR Memorabilia