The most ideal scope mount for any Benjamin / Sheridan that I've run across is the mount that's sold by Harry Smith of Louisana. His phone number is 337-662-3610. He came up with the idea and has them built. It is made of black aluminum and takes away all the risk of barrel separation which can happen with the pair of intermounts that puts pressure on the barrel's solder joint when tightened and frequently causes separation. His mount clamps only on the barrel right in front of the breech and the dovetails extend back over the breech / bolt area and has a cutaway on the underside edge which allows ample room to load the pellet.
The dove tails that extend back over the breech allows one to use a standard scope without the need for a long eye relief unit. SUPER SANITARY. I've sold 10 or 12 of them and everyone is very pleased. There are two sizes. One size fits the 22 and 20 barrels and the other fits the 177.
If I can figure out how to post a pic, I'll do it. But give him a call.