Where do you purchase ammo for the blue streak 5mm caliber and what size will fit this rifle is it?

The Sheridan Blue Streak air rifle uses a 5mm pellet. This is about .20 caliber- larger than the .177 pellet, smaller than the .22 pellet. I have been able to get these at Bass Pro Shop. There are also at least 3 lots of them for sale on Ebay right now. Only the 5mm/ .20 caliber pellets will work in your rifle- do not try to substitute anything else.

P.S. Have had one for years. These are extremely good air rifles- very accurate, very powerful.