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Norma 300 WSM Brass neck wall thickness

Can anybody tell me what the average neck wall thickness is on Norma 300 WSM brass out of the box. I am trying to decide what the best no-turn neck diameter will be for a new barrel I am chambering.

Thanks for amy help you can offer.
 
Here's what has work well for me. First I take a pieces of new brass I intend to use, prep it, seat the longest bullet I plan on shooting and then mail it to PT&G. they will provide me with a reamer that a great fit. You can either keep the reamer for later use or sale it for a little less the you paid for it, costing about the same as reamer rental would have run you except you ended up with exact chamber that you were wanting.
Regards
RJ
 
Norma neck wall thickness is 0.0145 average,,,Winchester is 0.015..Both are an average..I do a 100% clean up to 0.0140 on my 300 WSM on Winchester..My chamber is 0.004 over loaded round.
 
Hey guys, thanks for the input.

I have been told that a .3415' is good size for no-turn brass. And I am sure that will work well for out of the box brass. But what do you guys think if I decide or need to clean up the necks a little? For that will most likely push my clearance to .006' or greater.
 

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