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6mm br chamber headspace dia ??

The common comparators used aren't intended for precise numbers. Rather, comparative ones. So, as long as you use the same tool to measure fired vs sized, for example, it doesn't matter what the diameter is within reason. I've used pistol cases to do the job. Just push the shoulder back .002 with whatever tool and you should be good to go.
 
The common comparators used aren't intended for precise numbers. Rather, comparative ones. So, as long as you use the same tool to measure fired vs sized, for example, it doesn't matter what the diameter is within reason. I've used pistol cases to do the job. Just push the shoulder back .002 with whatever tool and you should be good to go.
that is sort of what i am doing. my chamber is very close to "0". i measure my hs gauge with a given comparitor and then measure my cases as i work on a die seting, with a stripped bolt. just check/watching numbers.
 
The common comparators used aren't intended for precise numbers. Rather, comparative ones. So, as long as you use the same tool to measure fired vs sized, for example, it doesn't matter what the diameter is within reason. I've used pistol cases to do the job. Just push the shoulder back .002 with whatever tool and you should be good to go.
I make my own, used it to make a 6 BRA go gaugeD156C4B0-B5A4-4A1B-9612-8DD5135DECCA.jpeg
 

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