If it is not choked to tight, yes.
Needs to be examined by a gunsmith.
Yes. You will have to shoot different brands and weights to see which one(s) your shotgun prefers.
Yes
yes
Not recommended
1. It can, but, it is not advised. 2. It is stated by Smith and Wesson that the model 14-3, which is the third change of the model 14 can safely shoot plus P ammunition.
Not recommended
http://www.wikihow.com/Shoot-a-Shotgun
Yes your Winchester model 1897 pump action shotgun can shoot buck shot through it.
Yes. It sure can.
Depends on when it was made. Go to Browning.com and ask.
You need to find a firearms instructor.