How much to reduce powder charge when changing primers?

Discussion in 'Reloading' started by txsendero, Nov 18, 2009.

  1. txsendero

    txsendero Well-Known Member

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    I'm shooting 7mm Rem Mag, WW brass, 71.9 gr Retumbo under 168 gr Berger VLD with Fed 215magnum primers. How much should I reduce the powder charge before working back up if I want to try WLRM primers? 1 grain? 2 grains? I am trying to find out if the change in primer may give me better ES.
    Thanks
     
  2. boomtube

    boomtube Well-Known Member

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    Are your present loads on the ragged edge of blowing your rifle apart?

    If not, you really don't NEED to reduce the charge at all.

    Or, you could just reduce by 3.4 grains and see what happens. ??
     

  3. johnnyk

    johnnyk Well-Known Member

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    I usually treat it like a totally different load. I start at the minimum and work up to max. JohnnyK.
     
  4. royinidaho

    royinidaho Writers Guild

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    I just change primers and let'er rip. However, you may wish to consider differently when going from standard to magnum.