My CFX shot them at 850 originally and now about 880. It does not "like" them however. I HIGHLY recommend you try Crosman Premier Hollow Points. They are cheap and not very popular, but shoot amazingly well in my gun. I got turned onto them from this forum about a year ago from another poster who had tried many pellets and was amazed at the CPHP's.
I can fully concur. It's flat out the best pellet in my gun and I've tested around 15 different kinds.