I'll tell you a horrible horrible projectile - whose the genius who came up with steel bb's??!!! Can you pick a more dangerous projectile? It kills rifling, it's horribly inaccurate and it'll BOUNCE of hard surfaces. Since lead shot was around probably before bb's it makes you wonder why it was ever chosen.
My Crosman 2240 likes the JSB Stratons as well, fortunately JSB still manufactures them