Thread: Case sizing
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Old January 23, 2019, 08:41 AM   #3
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Join Date: May 2, 2015
Location: Texas
Posts: 116
Usually, bolt guns have tighter chamber tolerances than semi-autos. This usually results in better accuracy in the bolt gun because of less slop. The additional slop in the semi-auto is intentional so as to improve the reliability if the more rapid feeding of the cartridges.

This response is merely an oversimplified explanation, not intended to be at all comprehensive.
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