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The Quality Cartridge web page tells me I have to ream the necks on the cylindrical brass after sizing.

"The .400 Whelen Basic is supplied as "Cylindrical". It is intended for use as a wildcatter's case to form many different .30-06 / .308 family wildcats from. The case neck will need to be reamed or turned after final forming."

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This is why I posted below this post concerning reaming.

I do not know how thick cylindrical standard based brass happens to be as I've never seen one let alone measured it.

I've used .25/06, .270, .30/06 and .35 Whelen brass for my .375/06IMP. Due to the necking up ie: stretching process, this brass thins in the necks, it does not get thicker.

Brass only gets thicker when it is necked down. The different headstamps on the cases does not worry or bother me - the formed ctg. is obvious - it's a .375/06IMP, not a .25/06, .270, .30/06 or .35 Whelen. Your .400 Whelen will be even more obvious and will NEVER chamber in one of the original named rifle chambers.

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Daryl


"a gun without hammers is like a Spaniel without ears" King George V

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