Thread: Pressure Trace
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Old November 23, 2018, 10:02 AM   #41
Savvy_Jack
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Join Date: February 4, 2018
Posts: 87
LOL, I got ya now. Yes, I have been in contact with a guy who's name starts with a T over at Buffalo Bore ;-)

I will try the HY manufacture and see if they will give me a hint as to the pressure of their cowboy loads which I would expect to be in the 5,000psi-7,000psi range. Cowboy loads are lightly loaded and won't even reliably register on the pressuretrace when using a 1 1/4" dia barrel ;-). I may have the barrel turned down later and have it fitted to my Stevens shotgun frame.

The 44-40 is a low pressure cartridge, it has a SAAMI max psi of 11,000 and an equal SAAMI max CUP of 13,000 as well as a C.I.P. max of 15,954psi (French CIP). Many publish loads reference mistakenly lists psi rather than CUP.

What started me with this whole psi mess was the fact that Lyman list high pressure loads to only be used in Group II rifles such as the Marlin 1894 and the Winchester 92 and 94. Lyman lists a heavy load of up to 21,900CUP. I have tested that load and my load result from that 21,900 CUP load is 19,628psi. No load I have ever loaded, before Pressuretrace, has even been higher. All of my Reloder 7 loads are less than 13,500psi and fall well inside Lyman's 21,900 CUP range. Even John Taffin's 2005 Guns Magazine load I tested was 14,000psi

Of course, we all know everyone's mileage may very and these figures are only being used for discussion purposes!!

Last edited by Savvy_Jack; November 23, 2018 at 01:10 PM.
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