you will have to do a web search on 44 shotshell ammunition.
You will have to shoot as many different brands and bullet weights as you can find/afford. The rifle will exhibit a preference for one or two.
Try e-gunparts.com
On line, gun shops, pawn shops
check cabelas that's where i found a spare clip for my rifle
A good place to find cheap rifle ammo is at J&G or The armory. They have sale on this stuff in bulk. You need to be very careful and make sure to clean the camber and let the rifle cool before you use it for the second shot.
you can find parts for your Stevens at bob`s gun parts .com
You can find a replacement firing pin for a Stevens model 87D 22 cal rifle at a gun dealership. You can also find it by contacting the manufacturer.
You sure it doesnt say '44 Shot' instead of '44 Short'? The .44 Shot cartridge was a popular small bore shotshell before the introduction of the .410. sales@countrygunsmith.net I'd suggest a trip to the library. Find the Standard Catalog of Firearms and look at the listings for Stevens. Your shotgun is probably a smoothbore version of the Tip-Up, Ideal, or Favorite rifle.
The Stevens 311 is a double barrel shotgun.
Try e-gunaparts.com
Try e-gunparts.com
Weing stocks