How much to reduce powder charge when changing primers?

txsendero

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Joined
Nov 29, 2007
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466
Location
Humble, Texas
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
 
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