Quote Originally Posted by Turnup View Post
Might be some difference between US and UK patents here. Henry Nock took out a UK patent on a breech design which (in various different ways) incorporated a small "pre-ignition" chamber either in the nipple pocket or at the base of the breech, for UK guns this is known as the "patent breech". The essential feature is that a part of the charge is constrained in the pre-ignition chamber and when ignited will project high pressure gasses into the main charge. Claims to increase Mv.

This does not seem to be the same configuration as described by DesG (or have I not understood it properly).
o.

tac