Carl,
There's another option besides jug choking, which has limited effect. Choke sleeves can be soldered in the muzzle. As I understand the method, the muzzle is reamed slightly, then a sleeve is soldered in, then the choke is adjusted to the desired constriction by reaming and polishing. The installation is supposedly nearly invisible.
I don't know if Orlen does these anymore, but there's a guy in Ontario Canada that's from England that does this. Precision Gunsmithing is his business name. I bought a shotgun from him 8-10 yrs ago. Orlen's old price list from a few yrs ago shows them at $75 to install.
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