Have you tried different value types? Like float or double, or maybe a different byte? Try going from 2 bytes to 8 to find out if its one of those, and also try float and double. After you've found the address, don't forget to pointer scan or use the manual way to find pointers. Also, if you're advanced enough, browse the memory region to find some other goodies like ammo, movement, and the x and y axis of your cursor. Hope this helps!
Edit: IF you're using cheat engine :P I know almost everything when it comes to CE.