For those that have some experience with this, am I loosing performance in some way by using a large rifle primer in leu of a large rifle magnum primer in my 7 saum? My research thus far has just mentioned trying both to see what's the most accurate. I have a pretty solid load worked up using H4350 and LRMs but figured I'd ask. Thanks
LRM or LR primers in a 7 SAUM
- Thread starter rootacres
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Either one will work just fine,
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A 7 SAUM is right in between LR and LRM primers. My rule of thumb is if the Cartridge is below 60 Grs of powder then I lean towards a standard primer and if it is above 60 grains of powder I lean towards a magnum primer. That is certainly not set in stone and if it is close to 60 grains then I will often times try both to see which preforms better on target or Chronograph. With a shortage and high cost of components today I would start with a Magnum primer in a 7 SAUM. That is what I use in my personal 7 SAUM.
As you said, your rifle will tell you. Try both and look at your speed, ES & SD. One will clearly be superior. I shoot an improved SAUM (6.5 Sherman Max). Mine does better with reg LR primers for most loads at well above 60 grs of powder?
Outlaw6.0
Well-Known Member
Beat me to the punch, try them both. I will say, I personally can't remember any of the short mags I load for preferring the Magnum primer over the Standard. To the point that I just save my Mag primers for the RUM.
But your combo may be different, there really is only one way to tell.
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