I know that in general your statement about metric cartridges is true, but the 7mm seems to be the exception. Most of the 7mm magnums seem to be about as popular as their 30 cal counter parts. I cant help but think that if the .280 had been called the 7mm-06 it might have done better.
I honestly can't think of another 7mm mag that has stood the test of time...7STW, RUM, WSM, SAUM are all dying slow deaths or have totally faded away.
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