The hinge on a normal break action double is well below the water table. consequently as the barrels start to open Everything on the breech end above the hinge line, certainly includes all above the table, moves forward. I believe that 87.5 stated for the Webly means the standing breech is actually tipped forward not to the rear.
That is correct On the Webley action it was the last machine operation an angled side and face finishing cutter was used to create the face angle ,radius and finish the action flats . Previously the action had been cut at 90 degrees as this was a datum face for other machine operations .I can not comment on other makers but I would assume they would be similar.
