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Yes it could be done, but you would have to locate a smooth bore barrel to change it with. Remember smooth bore barrels are not as accurate as a rifled bore barrel.
IT should be in the air duct going to the throttle bore.
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As the temperature rises, the mercury expands into a narrow bore, because the volume of the mercury increases. If the bore is very narrow then the extra volume has to go a longer way up the bore to accomodate that volume, so it is more sensitive to small changes of temperature. And it is easier to spot small changes of temperature, and read them from the scale more accurately. But if the scale isn't marked accurately in the first place you are no better off.
2 hours bore
try cleaning the egr valve passage and egr valve.
The 870 Wingmaster is still made in .410
Not unless you have to change the choke tube.
No
30 mph stock...40 if you change the exhaust and bore it out
you can do all kinds of stuff. bore it out, change the sprockets, whatever.
The narrower the bore the less liquid (mercury or alcohol) is required so the bulb containing the fluid will adjust more quickly to the temperature being measured. o.k well the narrower bore makes the liquid move slower up the thermometer so the accuracy is better ?????