I have owned the same barrel for some time now with a Bushnell 3x9x40 Bushnell Elite 3200 on it. Mine prefers 350 gr JHP's over 35 gr of Lilgun. I believe they're rated at 1397 fps out of a pistol so the rifle barrel will kick them up some more. Very accurate and will body slam a whitetail. If you're not into Lilgun then H110 also produces some great speed and accuracy from the 500. Good luck and good shooting.