There is no 1300 you mean a 1100?
Especially for modern and still produced look for LIKE CONDITION sales on gunbroker.com, gunsamerica.com, or gunsinternational.com. Without a very good description of condition evaluation isn't possible.
Tough question, the Remington model 550 is a .22 rifle not a 12 gauge shotgun.
50-300 usd
$300.00
100-400 USD
100-300 USD
$300.00
They didn't make them in 1942
Depends on model and age.
400 dollars
175 or so
from $100 to $400 depending on condition and barrel.
50-250 USD or so