I'm considering necking down Norma or RWS (if available) 7mm Mauser brass to 22 cal. Considering it for a couple reasons but they aren't really relevant to the question so I'll spare you the details.

So, has anyone here necked down Norma or RWS brass to 22 cal? How about 6mm? If you have for either, can you tell me what the neck thickness is?

Just trying to get an idea on how much would need to be turned off. Thanks!!!