Quote Originally Posted by Surpmil View Post
I'm having visions of a appliance that holds a No4 action 'in battery' while a hydraulic piston with a projection the diameter of a bolt and a simple captive firing pin, that will precisely measure the rearward thrust generated by various cartridges, dry and lubricated...
Don't even need a No.4 action to do that test, if all you're trying to do is read the rearward thrust. The "device" would need a very fast pickup to read the peak load though, as it only lasts 0.001-0.002 seconds!