Savvy_Jack
New member
As mehavey said, there is no correlation. However, SAAMI has tested the 44-40 in both cup and psi as I showed. 13,000cup is equal to 11,000psi as far as testing the same batch of cartridges in both a copper crusher test and the piezoelectric test. https://sites.google.com/view/44winchester/handloading/ansisaami-specs
We take those two test for the 44-40 and use a formula since they are so close together. Rather than post the "formula" here, I will post the reading material and let those of you that are interested pull the formula from it.
https://sites.google.com/view/44winchester/handloading/pressure-testing
Again, the formula is only good for close proximity results. Using the formula, some Lyman replicated HV loads using certain powders resulted in 18,000psi. Using the formula, that number equates to 21,276 cup, which is very close to the 22,000cup mark.
It may be much harder to equate higher pressures since cup and psi are not linear.
Lyman's 49th handloading manual lists nineteen rifles chambered for the 44-40. Lyman separates these rifles into two groups, Group I weak actions and Group II strong actions.
https://sites.google.com/view/44winchester/handloading/ansisaami-specs
We take those two test for the 44-40 and use a formula since they are so close together. Rather than post the "formula" here, I will post the reading material and let those of you that are interested pull the formula from it.
https://sites.google.com/view/44winchester/handloading/pressure-testing
Again, the formula is only good for close proximity results. Using the formula, some Lyman replicated HV loads using certain powders resulted in 18,000psi. Using the formula, that number equates to 21,276 cup, which is very close to the 22,000cup mark.
It may be much harder to equate higher pressures since cup and psi are not linear.
Lyman's 49th handloading manual lists nineteen rifles chambered for the 44-40. Lyman separates these rifles into two groups, Group I weak actions and Group II strong actions.
https://sites.google.com/view/44winchester/handloading/ansisaami-specs
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