Powders and accuracy

[The Sodbuster]

Some powders are marketed towards the target and varmint shooting crowd as providing the best accuracy.  Look at names like 10X, Varget, and Benchmark.  Are some powders more accurate for a given caliber in all rifles?  Are the above powders manufactured to stricter tolerances to promote better accuracy, such as benchrest primers?  Or is it all marketing? 

Given the fact that Varget and Benchmark generally list for the same price as Hodgdon's other powders, I'm inclined to think it's all marketing. 

[Wingman26]

Every rifle is different, what works in one might...or might not work in another.  I have shot some incredibly small groups using surplus ball powder in an AR15, and in that rifle Varget doesn't show much if any advantage at all, a lot of people like Varget, I'm not that fond of it since I can get the accuracy I want out of ball powders and not have to mess with Varget not metering very well, ball powder is just so easy to work with.   

In Zedicker's book "The Competitive AR15" he talks about a lot of the shooters at Camp Perry are using Accurate Arms ball powders.