Does a semiauto action make a gun less powerful? AR-15, SIG Stgw 57

Bloke explores the answer to this staple of Internet gun arguments: is a semiauto less powerful than a bolt action of identical chambering and barrel length?

Results spreadsheet: https://docs.google.com/spreadsheets/d/1n8oGpgIo5JrTYuDkgtXqYWQPAhUgFC1fNrIbfJ-1ZIg/edit?usp=sharing

Featuring an Oberland Arms .223 Remington AR15 (OA-15) and a 7.5×55 GP11 SIG 510 / Stgw 57, with a cameo from a 5.56mm Chartered Industries SAR80.

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Sturmgewehr 57
AR-15
stg 57

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