I suppose a ''C'' type would or could, I suppose a ''C'' type would or could, but would it be bad for the press?QUOTE]
In the beginning it was a design of the press, the reason or rational for the design has been lost and or forgotten.
but would it be bad for the press?
Cam over was a functional design, I have 3 Rock Chuckers, not one of the three will cam over. All three will lock up and or go into a bind/ A disturbing feature of the bind/lock-up is the effect it has on the ram. When the linkage goes into a bind the ram is forced out of alignment.
A video was made and posted on the Internet, the video was made while recording the ram coming up without a die, something like a no-lode condition. As soon as the ram reached to top of its travel the ram kicked forward.
Without a case and die installed in the press and no load condition the Rock Chucker appeared to be worn out. If the Rock Chucker was a cam over press the linkage would go into lock up after the ram reached the top and started down. There are RCBS presses that cam over, RCBS has published instructions on adjusting a cam over press and instructions on how to adjust a non-cam-over press.
When discussing the cam-over press they refer to the ram completing the trip up and then down as 'bump', the cam over press bumped on the way up and again on the way down, depending on how the die was adjusted.
F. Guffey