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Ok, so which is it?

Discussion in 'Shooting Related Threads' started by det131, Apr 21, 2010.

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  1. det131

    det131 Member

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    Mar 25, 2009
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    In recent threads regarding pressures and using the same load in Rem. or Win AA hulls the following statements have been made that appear to contradict one another. Assuming the same components in both hulls which would have the lower pressure?


    1. “comparing an example of the same recipe on the Alliant site in a Remington vs. a Win AA's hull. It appears that the Win AA's have a higher pressure (around 2000) than the Remington for the same recipe”


    2. “AA hulls have less internal capacity than Remington hulls. The same components in a smaller space will yield higher peak pressures.”


    3. “I shoot a load that is in an AA hull. It has less pressure than in a Remington”


    4. “Reducing case volume will give lower pressures (more for rifle or pistol loads - but also explains differences between straight wall and tapered shotgun hulls)”


    Someone asked me if he set up for just one load should he use the AA recipe and load it in both the Rem. and Win. hulls or vice versa?


    My advice was to separate the cases and load each according to published data. Simplicity does not trump safety and the only thing he can, “Set it and forget it,” is his table top oven.



    Jim
     
  2. dverna

    dverna Active Member

    Joined:
    Jan 29, 1998
    Messages:
    2,717
    Jim,

    From the Alliant web site:

    with 1 1/8 oz of shot and fig 8 wad and Win. 209's

    STS hull 18 gr. of Red Dot - 9500 PSI

    AA hull 17.5 gr of Red Dot - 9900 psi

    Does this help?

    Don Verna
     
  3. Remstar311

    Remstar311 Member

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    Sep 15, 2008
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    According to Hodgdon's data

    STS Hull

    Lead Shot 12 1 1/8 oz. Clays Rem. 209P Windjammer 17.5 9,500 PSI 1145

    AA Hull

    Lead Shot 12 1 1/8 oz. Clays Rem. 209P Windjammer 17.5 9,400 PSI 1145
     
  4. det131

    det131 Member

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    Mar 25, 2009
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    Dverna & Remstar311, exactly my point.


    Two published sets of data one reflects a significant pressure increase in the Remington hull, the other shows an increase in pressure in the Winchester hull. Guessing safe loads based on hull capacity, or any other formula, is why we see threads titled, "Another xxx blows up."


    Recipe for success: Published data, listed components, weigh, and load accordingly.


    Jim
     
  5. Neil Winston

    Neil Winston Well-Known Member

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    Jan 29, 1998
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    I've mixed them up so my shell boxes look like Christmas for 25 years. I've never given it a thought and never seen any reason to.

    400 PSI is not a significant pressure difference, believe me. You can get that sort of difference comparing Tuesday to Wednesday.

    I noticed the reduced case volume post too. My results are the other way.

    Neil
     
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