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Well spotted Simon
Greenie as Simon has said re live primers removal. I too have de-primed many live ones, usually due to some reloading balls up.
Have just deprimed 60 7x57 for a mate -...

Get your pliers out and collapse the necks. Discarded brass has a habit of sneaking back into service. ;)

Edit: Mmm just saw the 700 count, oh well you will end up with a very strong wrist ha ha....

I guess you are already fully aware of the potential issues shooting your type of platform and do check for proud primers?
Primers And Pressure

Mmmm yes don't use the Radway Green brass but I wouldn't rush into a primer change just yet. Maybe someone else with AR reloading experience can comment on best primers. CCI #41 are specifically...

Rem 7 1/2 Benchrest primers are excellent. On a par with CCI BR in my 223 for accuracy and low ES. Fed GM (SR Match) are not as good as the REM or CCI.

The only feature with the 7 1/2s is they are...

not sure what you meant by swagged? Did you just neck size or full length resize?

Cases over FL sized (sloppy) usually result in flat primers which is usually mistaken for a pressure issue. Primers not seated deep enough (as per 7x64) will cause misfires although generally...