The one on the right is my shotgun.
http://t3.gstatic.com/images?q=tbn:ANd9GcSNxgECrGBq85q6TLqzuD_rZR7hRBOTiikoR1E9xef_jTRKBA3M&t=1
Here are the rounds it takes
http://picturearchive.auctionarms.com/6847212120/5864624/eley500a.JPG
http://t3.gstatic.com/images?q=tbn:ANd9GcSNxgECrGBq85q6TLqzuD_rZR7hRBOTiikoR1E9xef_jTRKBA3M&t=1
Here are the rounds it takes
http://picturearchive.auctionarms.com/6847212120/5864624/eley500a.JPG