Not sure about this.
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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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. 0 -
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. 0 -
I think the strain gauge system picks up pressure spikes the copper crusher system never sees. 0
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