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subsonic .308 barrel length

Josh-L

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Barrel length really doesn't matter. You will have to find a load that works and stay around 1000 to 1050 fps no matter what length it is. Mine is 18 though if that helps.
 

Kid Glock

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Dunno if you're wanting a rifle chambered in .308 Win. or just any old .30 cal. If so, do a search for 300 Whisper.
I say prolly around 20" barrel length is optimum.
 

Josh-L

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Sierra 180 grain round nose Pro Hunter

1/12 for light stuff. If you shoot heavier then 180 like the 220 Hornady bullets then you need a 1/10.
 
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