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PetahW · September 18, 2011, 04:28 PM

AFAIK, the older "J" bore = .318", & the later "S" (spitzer) bore = .323".

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September 18, 2011, 04:28 PM	#2
PetahW Senior Member Join Date: September 19, 2008 Posts: 4,678	AFAIK, the older "J" bore = .318", & the later "S" (spitzer) bore = .323". .