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Casting bullets - BHN & Max chamber pressure

Discussion in 'Ammunition & Reloading' started by Benchrest, Mar 1, 2015.

  1. Benchrest

    Benchrest The Desert Planet Well-Known Member

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    As I continue into the world of casting I find I'm in need of clarification.

    As to BH & chamber pressure:

    Rick Kelter states BHN X 1,440 = MINIMUM chamber pressure http://www.lasc.us/heattreat.htm

    According to the chart supplied with LEE's Lead Testing Kit BHN X 1,278 = MAX pressure.

    lEE-BHN-chart_zpsajgjnpug.jpg

    According to this similar LEE chart MAX PSI (as above) becomes "working pressure".

    LEE-BN-chart_zps8qksy9ca.jpg

    Schaefer (frfrogspad) lists a formula of: BHN * 1,422 * 0.9 = Ideal cartridge pressure.

    Hence my confusion! Any cast boolit hand loaders care to chime in?

    Thanks!

    Jason