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Current factory 357 magnum loads CUP or PSI?

This is a discussion on Current factory 357 magnum loads CUP or PSI? within the Ammo Dump forums, part of the Firearm Forum category; trying to figure out if current 357 magnum 158grain laodings should be used CUP or PSI? Thanks...


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Old November 8th, 2010, 07:00 PM   #1
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Current factory 357 magnum loads CUP or PSI?

trying to figure out if current 357 magnum 158grain laodings should be used CUP or PSI?
Thanks



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Old November 9th, 2010, 02:30 AM   #2
 
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I don't know.

But I do know that CUP and PSI are somewhat related. CUP is Copper Units of Pressure, measured in PSI. It is (was) the standard way of determining pressure before modern electronic equipment.

I believe the current technology which allows a transducer or other electronic component gives a more direct measurement of pressure, and, since it's the most modern, is likely to be the one you need to reference.

PSI gets my vote.
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Old November 9th, 2010, 03:05 AM   #3
 
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Cup was a given "science" to the individual crush pellet reader !!!& could vary somewhat !!!Not to mention some used 4" vented , while others used 10" vented barrels ,while others actually used modified firearms !!!

The psi transducers show testers a whole new world of pressure curves & how they affect firearms & ammunition .

Hornady just came out with ammo that`ll surpass anything they loaded beforehand by 200fps , how did they do it not with bullets or primer/ case but with pressure curves from newly developed powders that hold a lower & longer peak pressure curve .

My ? to Hornady would be as a handloader is it 1 powder across the board or different powders developed for different case capacities
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