how do you measure barrel up pressure?

[Peter Laidler]

That's a very interesting conversation from Patrick as we used a similar idea to show that barrels really do vibrate, are damped and do indeed lift from the fore-end in the case of the No4. With the fore-end correctly set-up and munted in the layer, put a slip of paper between the barrel and fore-end and tie a bit of string and a weight to the end of the paper that hanging outside the fore-end. When you fire the rifle the weighted slip of paper will slip out as the barrel lifts. But better still, on a high speed video you'll see the paper slipping out in a couple of stages as the barrel lifts and reaserts itself a couple of times.

We used to measure the muzzle lift using a simple (but calibrated annually I hasten to add.....) spring balance...., the type used by fishermen. But be warned. Don't get one that over exaggerates the weight!