100-400 or so
The value of the Remington Model 8 varies greatly with its condition. On average, this gun sells for about 400 dollars to about 1100 dollars depending on that condition.
1000
No such model in the Winchester line. Remington has the 1100
Value of ANY gun is based on EXACT make, model, variety and condition. You need a hands-on appraisal.
The value of any firearm is based on exact MAKE, MODEL, and CONDITION. There are dozens of different version of the Model 1100. Values can range from about $250 to $700 for different versions in different conditions. You best bet is to take the (unloaded) gun to a local gun shop or gun show for a hands-on assessment.
I paid $725 for mine and absolutely love the gun. It has never messed up on me and has killed many birds.
It's a solid $850 shotgun, I don't think you can find one for less.
This is a Remington Semi-automatic shotgun. With out calling Remington to identify the exact gauge and knowing more about how the gun is configured it is only possible to provide some very broad estimates. Gun condition (how badly worn the gun is and features like a vent-rib, Rem-chokes or fixed etc drive the value of the gun. A low figure would be ~200.00 for a working, worn, not abused field gun to a high of possibly $400.00 or more for a field grade gun in excellent conditon. Trap, Skeet or highgrade wood or engraving could drive this prices much higher. Once you get collect a bit more information on the gun you could look on any of several websites to see what a similar gun has as a posted asking price. You can learn mor about your gun on the Remington website--www.Remington.com and a call to their support line will get you the year of manufacture.
The S&W gun is a model 1000. They are both semi auto shotguns. The S&W gun, discontinued for some years, was made in Japan by Howa. Just my opinion, nowhere near as good a gun as the Remington
Check related links to Remington Society of America for barrel date code information.
Too many variables to give good answer. Take it to a gun show near you, or search the internet gun websites.