Dear all
I have owned a 7 Rem Mag for the past 20 years but have never known of what you might describe as an idiosyncrasy of the design of this cartridge.
That is to say that new factory brass, is 20 thou shorter on the shoulder than the SAAMI spec of a 7 Rem Mag chamber.
A smith friend of mine informed me of this a few weeks ago and I have some new Winchester and R&P brass so when I got home I meansured it with my head spacing collet tool and sure enough he was right! Anyone else know of this phenomenon? I was amazed.
