No exact number that I know of. min 2 thou and best at 2 to 4 thou. research the carteideg you want to shoot and the barrel you will use and "do what they did".
I can tell you that a "NO TURN NECK" is the very best way to go. Your asking the question indicates you are not in the Bench Shooter class that would get any benefit from playing with neck thickness and clearance.....1 MOA.
Use NORMA brass or you will be fighting brass that has uneven neck thickness that might cost you .5 MOA. Lapua is as good. Price the stuff and make a choice and never deviate.
HTH,
John
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