? Will any "O" type press cam over?

The cam over acts like the locking action of a vice grip. The problem is you can keep screwing the die in lower and with enough strength, still achieve a cam over until the linkage breaks or the carbide die cracks.

At the end of the day, it's all about how much shoulder bump is needed to get zero head space brass to chamber fit. Not difficult to accomplish, and easily repeatable if one logs those die measurements. For those who don't shoot competitively, this is accurate enough and to within .001" or less, and with most standard commercial quality brass, RP, Win, FC, and such.

GS

The cam over acts like the locking action of a vice grip.

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lever lock, snap lock with unlocking lever. Jam, cram or lock.

F. Guffey

My C&H Heavyweight Champion cams over.