How much to reduce powder charge when changing primers?

txsendero

Well-Known Member
Joined
Nov 29, 2007
Messages
433
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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