I have a Rock Chucker for heavy duty work. Sometimes I take it to it’s limit, recently sizing down PCed boolits, that had a little too much powder and accumulated at the bases. My bench is pretty solid. It’s built on 3/8 x 1&3/4 inch angle iron. Besides being almost at the limit of my strength, the bench wants to start turning over. It would be nice if I could secure it to the floor, but it’s gravel. I dream of pouring a pad.
Anyway, the other day I discovered I could get a lot more power and stabilize the bench by standing up, turning around and putting my but against the bench, half sitting on it. (I have the handle on the right side while facing it). Standing up with my back to it, my right arm is in position for the handle and I can even use two hands/arms if needed. It makes a Big difference. Besides more force, the bench has less of a tendency to tip over.
Maybe this is not something new, but I just discovered it and it may be interesting for others.