C presses, with the exception of the RCBS Summit, which is not a classical C, and with the exception of a few very expensive almost custom C style eg the Sinclair, don't have the strength of a closed O type press.
There's nothing wrong with say neck sizing and bullet seating with a C press but full length sizing is what sorts them out.
Some will argue that a C press with the open front gives you better access but that would be the only redeeming feature. And if the C press is alloy as well......
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