Thank you for your replies so far.
'IF' it were ever used for blank firing, it would be done with with either a proper carriage, or potentially this carriage but with proper wheels and strengthening where required. I have not inspected the carriage personally but I know it was only built as a display mount.
You are correct, I meant 200 grams by weight. I do however take your point about 2F.
The tube in question does have historical significance though. It is the only known survivor of 4x 6lbr guns used by the South Australian Volunteer Artillery in the 1860s.
Also, what do you all think of this statement I read:
"Antique brass cannon should not be fired, even with blank charges, owing to changes in the bonding of copper and tin (the metals which comprise gunmetal), a problem of crystallization which varies from one brass gun to another, gradually weakening over the centuries."
For a bit of background, I am actually a trained and experienced gunner, and own a full size replica 3" bore smoothbore field gun which I use for both blank and ball firing (see attached pictured of my own personal gun, uniform is South Australian Volunteer Artillery 1862-65 - nothing to do with the Civil War
So with the above points in mind, is it still a hard no?