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.400 NitroExpress.30/06 brass with is the same as .25/06, .270, .280, is loaded to 63,000PSI in the smaller calibres. Due to the weaker Springfield rifles and actions of the 1st war, '06 ammo itself is held to lower pressures. For modern rifles, wiht handloads, it's pressure allowable is the same as any other calibre on the same case.

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Due to it's larger bore size and attendant greater expansion ratio, the 8mm on the '06 case will exceed any ballistics the .308 cal.'06 can produce, with the same bullet weights,at identical pressure.

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I said the velocities with same weight bullets would be similar, as indeed the above data shows, not that they would be identical. The data shows the same or perhaps slightly greater velocity for a 187 grain 8X60S max load as what can be expected with 180 grain .30-06 at the same pressure limit.

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"Serious rifles have two barrels, everything else just burns gunpowder."

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