Quote:
I'm fairly sure that the Remington 7-1/2 "benchrest" primer that Nosler recommends in that guide uses a magnum priming compound
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Note the flash from the 7 1/2 primer compared to the other Small Rifle primers.
http://www.6mmbr.com/PrimerPix.html
There is also this.
http://www.handloads.com/misc/primers.asp
And this from Hornady #7.