Let me tell you about what club manufacturers refer to as C.O.R. .830.

You find this all over advertising now a days.  It has been a big part of advertising the past few years.  The C.O.R. .830 has not changed (with the major companies at least) in years.  This is not a new thing, just new in the advertising.

The driver you purchased 5 years ago has the same C.O.R. as the models being sold now.  The materials being used have changed, the size of the club head have changed, but the C.O.R. has not changed.  Don't let the advertising of this feature guide you in buying a driver. 

The C.O.R. on the Callaway clubs, are the same as is with Cobra, TaylorMade, Nicklaus, Titleist, etc.