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Rock Chucker
The original Rock Chucker was a heavy-duty reloading press that replaced the earlier RCBS A-2 press. The primary change was the use of cast iron in the Rock Chucker frame, compared to cast steel in the A-2. The Rock Chucker, like the A-2, had a 7/8-inch, 14 threads per inch (TPI) threaded hole in the top of the frame casting to accept reloading dies. The Rock Chucker had its operating handle on the right side so the user could manipulate cartridges with the left hand while raising and lowering the press ram with the right.
Rock Chucker 2
The Rock Chucker 2 substituted replaceable threaded bushings for the 7/8-inch by 14 TPI threaded hole. It was furnished with a 7/8-inch by 14 TPI bushing to accept standard reloading dies, but could also accept larger bushings for reloading shotgun shells, .50 caliber cartridges, and other large cartridges. The Rock Chucker 2 also replaced the original light green crinkle paint with a dark green epoxy finish to facilitate cleaning, and replaced the bicycle grip-style handle of the original with a more ergonomically correct round knob.
Rock Chucker Supreme
The Rock Chucker Supreme has the same features as the Rock Chucker 2, and adds ambidextrous handle attachment points so the user may place the operating handle on the left or right. The Supreme also has a larger frame opening than previous Rock Chuckers, to better accommodate long rifle cartridges, such as the .50 caliber military cartridges. This Rock Chucker replaces all previous versions of the press.
Rock Chucker Bullet Swaging Press
RCBS makes a version of the Rock Chucker Supreme that is intended for bullet swaging (forming bullets under pressure). It uses the same frame as the standard Rock Chucker Supreme, but has a solid ram instead of the hollow ram that all other Rock Chuckers use. Bullet swaging is a much more high-stress operation than cartridge reloading, and the hollow ram is more likely to deform under pressure.
This version of the Rock Chucker is a special-order item.