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Bart B. · September 12, 2014, 06:57 PM

SAAMI specs for .30-30 bullets are the same as .308 Win and .30-06; .309" -.003" tolerance. Bore and groove specs are also the same for all three; .300, .308, and +.002" tolerance. See pages 57 and 66 in:

http://saami.org/specifications_and_...wnload/206.pdf

168-gr HPMK bullets have been shot at 2100 to 2200 fps from 1:12 twist .308 Win free rifle barrels winning Olympic and other international gold medals. So, 165 SBT's from 30-30 barrels will do just fine.

AZredhawk; What's this "more bearing surface to engage" about? Go to SAAMI's web site then compare the bore and groove specs for the 4-groove .308 Win and 6-groove .30-30 then explain them relative to bearing surfaces to engage and spin needed to stabilize them.

September 12, 2014, 06:57 PM	#9
Bart B. Senior Member Join Date: February 15, 2009 Posts: 8,927	SAAMI specs for .30-30 bullets are the same as .308 Win and .30-06; .309" -.003" tolerance. Bore and groove specs are also the same for all three; .300, .308, and +.002" tolerance. See pages 57 and 66 in: http://saami.org/specifications_and_...wnload/206.pdf 168-gr HPMK bullets have been shot at 2100 to 2200 fps from 1:12 twist .308 Win free rifle barrels winning Olympic and other international gold medals. So, 165 SBT's from 30-30 barrels will do just fine. AZredhawk; What's this "more bearing surface to engage" about? Go to SAAMI's web site then compare the bore and groove specs for the 4-groove .308 Win and 6-groove .30-30 then explain them relative to bearing surfaces to engage and spin needed to stabilize them. Last edited by Bart B.; September 12, 2014 at 10:09 PM.