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Why does some load data stop shorter of the max than other?

Discussion in 'Handloading and Reloading' started by ddc, Nov 10, 2013.

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  1. ddc

    ddc Member

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    For example I’m looking at 41 mag loads using Ramshot Enforcer and True Blue.

    From Ramshot’s data here are two loads:
    1. Enforcer with 210 Nosler JHP max pressure 35,800
    2. True Blue with 210 Hornady XTP max pressure 32,000

    I can see that the Enforcer 35,800 is very close to SAAMI max (36,000 I believe) but doesn’t the True Blue load have about a 4000 PSI “cushion”?

    I realize that those are two fairly different powders and burn rates. Is there a technical reason related to that fact or did they just stop short because they ran out of test time or is something else going on?

    Thanks!
    Don.
     
  2. buck460XVR

    buck460XVR Member

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    Could be they could not get any more powder in the case.
     
  3. 243winxb

    243winxb Member

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    True Blue is a faster burn rate than Enforcer. So they are building in a "safety margin" by staying away from maximum pressure. When working up from the starting load, 1/2 grain means a lot pressure wise, when using the faster True Blue. No so with slower Enforcer. This is my guess.
     
  4. LiveLife

    LiveLife Member

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    As I understand published load data, they are listings of "average" maximum pressures measured during pressure testing based on SAAMI average maximum pressures.

    So even if they aimed to come close to SAAMI maximum pressures, lower pressures measured in their test samples would lower the average of maximum pressures published. Some powders may vary more than others in their maximum pressure ranges.

    That would be my guess. Others may offer more accurate technical explanation.
     
  5. ddc

    ddc Member

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    Perhaps but for this particular example the True Blue load takes up less than a third of the case.
     
  6. Steve C

    Steve C Member

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    It is a misconception that the goal of a loading manual is to give maximum loads that are at the SAAMI maximum cartridge pressure. The manuals list the maximum powder charge with the component combination where to go beyond produces either erratic pressures or deteriorating accuracy AND is no greater than maximum SAAMI pressure guidelines.
     
  7. Walkalong

    Walkalong Moderator Staff Member

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    243winxb & Steve C gave excellent answers to your question.
     
  8. ddc

    ddc Member

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    Got it. Another little tidbit to salt away. Thanks to all. :)
     
  9. Rushthezeppelin

    Rushthezeppelin Member

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    I'm sure different test guns have some role to play in it.
     
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