Thank you for letting me join your happy group! The title 'Floating Chamber' comes from the device invented by the late, great, David Marshall 'Carbine' Williams; I am a scholar of his life and patents. My avatar show a chamber from one of my M50 Winchesters. (Circa 1954) The models 50/59 were the first semi-autos to have a non-recoiling barrel and the M59 with its 'fibre-glass' barrel had the first screw-in chokes.
Here endeth the first lesson!
I am a retired Maths/Science teacher and have keen a homeloader of shotgun cartridges since 1962.