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In order from largest to smallest:
M1 Garand = 30-06 (7.62x63)
Mosin Nagant 91/30 = 7.62x54R
Springfield M1A Scout EBR = .308 (7.62x51)
Come to think of it I'm not actually sure which is the loudest though. I assume the 91/30 just cause its the oldest design.
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BOOM 
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