They make different primers for a reason. The pressures indicated on the tests are with the specific primer and powder used. When you substitute a differnt brand and type of primer you change the whole equation.

Yes, the 9mm is a high pressure round so if you add additional pressure with the SR what will you end up with?

I have posted an old CCI primer energy chart and when that was produced, the SR was not that much different than a SP. In fact a SPM had more energy than a SR.

As fred stated if the cup material is harder and does not seal in the pocket, then what?

Look around and find the correct components even if it means buying only, buy a lot. They are not going to go bad.

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Still Running Against the Wind