Are yout talking about the standard 338/06 or the improved version. The improved version does come within 100fps of factory 338 WM velosities but the standard is a little slower yet. Heavy loads in the 338 WM can out pefrom it but probably not enough to make a practical difference on game. I wouldn't be surprised to see some factory ammo out soon, weatherby already loads in and Nosler in thier new line of ammo. We might see a federal loading coming out someday soon.