I can get a gunsmith to open out the chokes, but what choking do you suggest?
Full and full for most game and clay work is going to be like shooting with a rifle.
You may miss clays and birds, and some of the birds you do hit, except the ultra-high ones, may be needlessly damaged.
The most practical choking for any gun that’s going to be used for a bit of everything is quarter and half, so I suggest you go for that.
On a technical point, any operation which involves removing metal from a barrel means that it should be re-proofed when the work is complete but most gunsmiths don’t bother submitting guns to the Proof House after such minor work has been done.
As well as choke opening, this also includes having forcing cones lengthened, and barrel porting on competition guns.
Technically speaking – any choke removal should result in a gun being sent to the Proof House for re-proof.