Coach,
The Sheridan company was named after the famous General Sheridan.

They chose the 5mm pellet as it seemed to be more efficient (and still is) at the time.

Predator pellets makes a very good came 5mm pellet. You can get them and many others through Pyramid Air in Ohio,or closer to you,Airguns of Arizona.

All of mine have the Willaims receiver peep sights and I have a dab of orange expoxy on the front sight. Makes a difference.

The beauty of these Sheridan Air rifles (and others too) is that during inclement weather,I can use my own personal indoor range.

You know,downstairs,from the laundry room,through the shop to the pellet rap on the wall. Works just fine for me!!!!!

Wayne