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jimbob86 · January 4, 2013, 01:25 PM

I think twist rate had more to do with what weight bullet .... the microgroove rifling works better with jacketed bullets than lead, IIRC. Cast boolits do better with the deeper "Ballard" cut rifling, as I understand it.

Eldest's 30A has a 1 in 10" twist, and does well with 150's, 170's and Ok with 110's.

January 4, 2013, 01:25 PM	#5
jimbob86 Junior member Join Date: October 4, 2007 Location: All the way to NEBRASKA Posts: 8,722	I think twist rate had more to do with what weight bullet .... the microgroove rifling works better with jacketed bullets than lead, IIRC. Cast boolits do better with the deeper "Ballard" cut rifling, as I understand it. Eldest's 30A has a 1 in 10" twist, and does well with 150's, 170's and Ok with 110's.