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As long as it works for us does it matter? When installing barrels I use quality GO/NO GO gages to ensure the headspace is set accurately. Accuracy is necessary to do the job correctly. When reloading the goal is precision not accuracy. If all 50 rounds in that box are all as close to being identical as I can make them I am happy
If you don't understand the difference between accuracy and precision, I suggest you educate yourself.
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The question was about determining the length of the chamber from the rifling at the end of the throat to the bolt face. I understand you can not help yourself but it appears you almost talked it to death.
I was wondering if RC20 could determine the distance from the rifling to the bolt face, do not get me wrong, I was impressed with that tid-bit about removing the extractor, there are rationales and reasons for removing the extractor I do not believe the reason "cause" is good enough. I go not believe, "because I have a bench rester friend and he told me to do it is a good reason.
F. Guffey