My Rock Chucker came to me second hand, the PO was my boss at the gun shop. He told of wearing out, as-in nearly flame-cutting through the top strap of a long barreled (8-3/8"?) S&W Model 27. Told me that he kept every box flap from a large box of primers. ~50,000 mostly hot .357 Mag loads thru that revolver, every one of them loaded on what is now my RC. Ram has no more wiggle now than maybe a tiny bit more than would be needed for it to function.
That said, the Co-Ax has fascinated me for a while so I finally bought one. Need to get it on an Inline Fab QD plate and get it going.