This should be correct
Whitworth Compressed Fluid Steel barrels were first used on the Grade 7 "AAH Pigeon Gun" in 1894.
Titanic Steel barrels were offered for Grades 3 - 6 from 1897 until the introduction of
Acme Steel for Grades 4 - 6 around 1910.
The Grade 0 VH was introduced in 1899 with
Vulcan Steel,
Parker Special Steel barrels appeared on the Grade 2 GH in 1908, and the Grade 1 PH & NH received
Parker Steel in 1917.
The Grade 8 A1 Special introduced in 1907 had Whitworth barrels until after WWI, then
Peerless Steel.
And BTW: Hunter Arms
Crown steel appeared with the introduction of the Pigeon Grade in 1893,
Nitro in 1895,
Armour later Armor in 1898 with the 00, and
Royal steel in 1901. We have barrels with the LLH mark of
Laurent Lochet-Habran on all 4.
Now we just need evidence that there was a difference in any of those barrels
Threaded Mode