Head space and a loose barrel. The threads on a Springfield barrel shank and receiver is 10 threads per inch, for most is easy to keep up with, degrees can be converted to thousands, when installing a Springfield barrel I use a feeler gage, if you are interested in the amount of additional head space is created with the loose barrel use a a feeler gage to measure the gap between the front receiver ring and the shoulder at the end of the barrel shank, .001 thousands gap = .001 thousands additional head space. When the slack is removed between the receiver threads and shank threads slack is removed, the barrel shoulder and receiver ring do not crush, one of the most important factors that should not be overlooked, the barrel and receiver index, when indexed the extractor aligns with the receiver and extractor cut in the barrel.
Because of the extractor, extractor barrel cut and receiver there is a limit to how far the barrel will rotate, to remove the barrel the bolt must be removed.
The Mauser has 12 threads per inch.
F. Guffey
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