How much to reduce powder charge when changing primers?


Well-Known Member
Nov 29, 2007
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.


Well-Known Member
Oct 8, 2007
Mountians of SW NC, near Asheville
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. ??


Well-Known Member
Jan 20, 2004
Blackfoot, Idaho
I just change primers and let'er rip. However, you may wish to consider differently when going from standard to magnum.

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