Originally Posted By: wazzabie
would these 2.5in shotgun shells be to hot for a Ithaca 1920 Flues?

http://gamebore.com/uk/cartridge/game/12G-Gamebore-Bismuth


In USA there is no guarantees your gun is safe to shoot with them. I read in Great Britain they can take old shotgun to gunsmith who determines if gun is a candidate for standard modern proof. If so it is submitted to one of the two proof houses for testing. If it passes it can be used with standard CIP game loads of appropriate shell length.
If the gun is in very good mechanical order most Americans would probably use RST non-tox loads in the antique Ithaca shotgun.