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Thread: 44-40 Videos, Pressure Test Pressure Curves

  1. #21
    Boolit Grand Master Outpost75's Avatar
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    Bravo Zulu, great work!
    The ENEMY is listening.
    HE wants to know what YOU know.
    Keep it to yourself.

  2. #22
    Boolit Master Savvy Jack's Avatar
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    I took the best shot, from each recent thirteen 10 shot groups, that best represents the average pressure of that group and made a gif. The only "pressure spikes" observed with any of the 96 total tests over-all were the high power loads of fast burning pistol powders. There were no "pressure spikes" for any normal loads regardless of using pistol powders or rifle powder. Early black powder loads had the same pressure curves as several of the pistol powder loads used.

    There are slower burning loads which have a shallow initial burn which the pressures drop by 1 millisecond. The loads that dropped pressure faster were typically the fast burning pistol powders near the Bullseye/Titewad/Red Dot/Clays/700X/Titegroup/WST/Trail Boss powder burn rates that drop down faster, giving the "pressure spike" appearance. Even then, the peak pressures from those particular charges exceed or would exceed 13,000cup/11,000psi MAP set for Winchester 73' and revolver use, only to be used in the Model 92' or Marlin type actions

    All 96 tests results can be seen here

    Some Pressure Test Curve Charts can be seen here





    Smokeless Powder Pressure Curves, click for animation
    Click image for larger version. 

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    "Pressure Spikes", or the lack thereof
    1. Fast Ignition, Fast pressure drop
    2. Fast Ignition, Slow pressure drop
    Of which both already exceed 11,000psi
    Click image for larger version. 

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    Last edited by Savvy Jack; 06-25-2022 at 02:17 PM.

  3. #23
    Boolit Master Savvy Jack's Avatar
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    Black Powder Pressure Curve
    Click image for larger version. 

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    Black Powder Pressure Curve, click for animation
    I do not know the gif wont work, here is a link to all of them
    https://sites.google.com/view/44winc...essure-testing
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by Savvy Jack; 06-25-2022 at 06:51 PM.

  4. #24
    Boolit Master Savvy Jack's Avatar
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    Here are the absolute simplest results in a timeline format minus all the important details

    Click image for larger version. 

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  5. #25
    Boolit Master
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    Quote Originally Posted by Savvy Jack View Post
    Here are the absolute simplest results in a timeline format minus all the important details

    Click image for larger version. 

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    Great summaries in this thread - thanks for your hard work. Reloder 7 seems to be the perfect powder if the user is not focused on BP.

    I don't have a chrono but have been using 20+ grs of IMR 4198 with good accuracy and no signs of excess pressure - BUT - 9.0 grs of WW231 is more accurate with JK's 43-215C projectile and a real tack driver in my old El Tigre. Regularly produces one ragged hole at 50 yds and only opens up a bit at 100 because of my poor eyesight.

    I wish I could find Reloder 7 but it's scarce as hen's teeth around here - I've looked in the local LGS and box stores to no avail.

  6. #26
    Boolit Master Savvy Jack's Avatar
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    Where are the Pressure Spikes?

    I guess if compared to modern BP loads, all other loads produce pressure spikes?

    This WST load is the closest thing I have seen to a Pressure Spike for loads IF USED in the Winchester 73' and Revolvers.

    https://sites.google.com/view/44winc..._gWA248koljW9k

    Click image for larger version. 

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    Click image for larger version. 

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check