Fact-The .338 ultramag has a larger case capacity than the 340wby.
Fact-a larger case capacity provides the potential for more velocity with equal barrel lengths and identical bullets.
Fact-Most people with any experience reloading will realize that this is true reguardless of manufacturers published velocities..

the 300 ultra has more case capacity than the 300 WBY but i've yet to see one outshoot my WBY on the range.maybe case design has something to do with it.

Are we talking accuracy or velocity?If it is accuracy,the determining factors are rifle quality(bedding,barrel,trueness of action etc) good reloading components and proper load development.If you are talking velocity the 300ultramag will produce more velocity when both are loaded with proper powders to design pressure and fired in equal length barrels.The dual radius weatherby case may look nice to some people but it does not add velocity or accuracy.

Oh yea, where you located? Do you think you could make it to Westminster, MD or eastern KY? I have beat the speeds of every weatherby, including my own, I have seen.

After Bigcountry takes your money in Westminster, Taneytown's only 15 min's up the road.....I'll take whats left .53 moa was my worst group I ever got......30-.33 is average.

I am just talking speed wise.

Stubblejumper:

Show me some solid data and I might believe you, and don't make it up . Good luck.

Taken from december 1999 shooting times magazine page 52.Article on 338ultramag.

case capacity 338ultramag-116.1 grains water

case capacity 340wby mag-110.5 grains water

I believe Stubble supplied the proof....exactly how do you cook crow to make it taste good?

Bigger is not necessarliy better,there is nothing wrong with a 338-06 or a 35 whelen, they can put the game down!Less recoil,and cheaper to reload. They are designed off the 30-06 case,no big magnum her just a honest game getter.No bullet can replace good bullet placement when hunting.Its all in that,99% of the time. Those are the ones i would go with and do have. vangunsmith