I have a couple of guns with screw in or adjustable (polychoke) chokes, and probably just as many with fixed. I have 3 barrels for my Remington 1100 (26" IC, 28" Mod, and a rifled slug barrel). I also have an Ithica M51 with two barrels (full & improved Cylinder).
However..........."choke" is a combination of many factors: bore constriction, for sure, but also velocity, shot size, shot hardness, payload, blah, blah, blah......why spend the money for an extra barrel when you can easily manipulate the ammunition (either via handloading or factory loads) and get similar results?
I can see the popularity of the screw in chokes....gives a hunter with less pocket money more options, and isn't "ugly" like a polychoke or cutts compensator (although I swear by my polychoke....I have one on two guns, and they have done alright by me!).
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