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Not sure about this.

n/an/a Member Posts: 168,427
edited December 2013 in Ask the Experts
I just read about working up loads for a 404 big bore. The author stated that he could get 75 - 125 higher fps with one powder over another with the same chamber pressur. He was using the strain gages. This does not seem correct.

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    MIKE WISKEYMIKE WISKEY Member, Moderator Posts: 9,988 ******
    edited November -1
    most rifle powders have the same 'energy' content per grain (weight), there are however many different 'burn' rates. a 'faster' powder will have a shorter pressure 'curve' and a shorter bearing time on the bullet than a 'slower' powder.
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    Hawk CarseHawk Carse Member Posts: 4,374 ✭✭✭
    edited November -1
    It can happen. It just means his first powder was not a very good choice for the caliber and the second was more progressive burning and probably a bit slower.
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    charliemeyer007charliemeyer007 Member Posts: 6,579 ✭✭✭
    edited November -1
    I think the strain gauge system picks up pressure spikes the copper crusher system never sees.
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