I've got a few barreled actions I'm wanting to get pre fits for. I have a barrel nut wrench but no barrel vise. Since the barrels are different diameters I thought about making a action vise with a piece of 4x4. I would cut the 4x4 down to size, then drill a hole (smaller than action diameter) through the 4x4. I would then screw one of my headless bedding screws into the front hole of the receiver. Then drill a hole for the headless screw to set down in the 4x4 which would keep if from turning when clamped down. Is there any reason for using the blocks on the barrel instead of the action?