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You mentioned necking up a .30/06 to a .338/06. If you were to do so with the same weight projectile to the same velocity, would it take more, less or the same amount of the same powder? Seems to go to the crux of the matter
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I'm not guffey but i can answer the question. It would take more powder in .338-06. The same way it takes more in 30-06 than in 270.