What board are you on? Asking your kit to go to said number, isn't as simple as putting in a number in BIOS and rebooting, you're going to have to perform a couple of trial and errors with the ram kit. You're going to have to tinker with each timing until you reach CL and that will also depend if your ram kit can go that tight. What voltage are you currently on? What platform?
That probably won't happen.
Download Taiphoon Burner: http://www.softnology.biz/files.html
Run it and click on the Read button to get the necessary info about your exact RAM.
Then get and use the DRAM Calculator from TechPowerUp to find the best possible timings for your RAM on your MB.