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Auto 5 is full choke barrelled and my favourite field gun by far. Such a pitty it cant take steel. I havnt changed the 3/4 in the extreema since I got it. The only gun I regularly change chokes in is...

Before and after photos could be useful for bush gunsmiths. The internal brileys get stuck too, and with the keyway being thinner are easier to chip and become complete bastards.

Penetrating oil, then heat the outside of the barrel and try again preferably with a sharp impact. If not sucessful try tightening it then back the normal, way that often loosens a siezed thread....