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Campfire 'Bwana
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OP
Campfire 'Bwana
Joined: Jun 2006
Posts: 46,318 Likes: 18 |
A wise man is frequently humbled.
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Joined: May 2005
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Campfire Outfitter
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Campfire Outfitter
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"Civilized men are more discourteous than savages because they know they can be impolite without having their skulls split, as a general thing."
Robert E. Howard
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Joined: Dec 2006
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Campfire Ranger
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Campfire Ranger
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Campfire 'Bwana
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Campfire 'Bwana
Joined: Nov 2010
Posts: 37,240 Likes: 11 |
My 6.5-284 is 8.5 twist. It will shoot 140's into the teens at 100. I've read that you don't want more twist than needed. Over twist can add resistance at the cost of velocity. 8 twist in the 6.5 should be OK.
DF
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Joined: Dec 2006
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Campfire Ranger
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Campfire Ranger
Joined: Dec 2006
Posts: 24,851 |
Further, my Winchester 70 I used to have had the 9" twist and I regularly shot 140's out of it with no problem.
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Joined: Nov 2004
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Campfire Tracker
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Campfire Tracker
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Campfire Tracker
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Campfire Tracker
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Joined: Mar 2003
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Campfire Tracker
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Campfire Tracker
Joined: Mar 2003
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I shot a lot of 140s in my 6.5-'06 with 9" twist...jim
LCDR Jim Dodd, USN (Ret.)
"If you're too busy to hunt, you're too busy."
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Joined: Jul 2008
Posts: 918
Campfire Regular
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Campfire Regular
Joined: Jul 2008
Posts: 918 |
I like the 1 in 8 twist as I only shoot 140's and heavier! My Krag loves Sierra 160 Match Kings!
Semper Fi USMC/0331
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Joined: Sep 2005
Posts: 4,299 Likes: 3
Campfire Tracker
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Campfire Tracker
Joined: Sep 2005
Posts: 4,299 Likes: 3 |
9 twist will work for faster (25-06, 257 Roy) and 8 twist will work for the rest of the slower calibers. But, with you in higher altitude Colo, 8 & 9 will work for both.
I run 8.5 in a Krieger with 130 VLD's @ 2850 from my heavy 6.5x47. Put 10 into .49" @ 100 today.
I run 8 in my Broughton for 140 PT @ 2850 from my other, lighter, 6.5x47. Put 10 into .6" @ 100, also today.
Both temps were around freezing = colder, thicker air which can destabilize a slower bullet not twisted enough.
Alan
Last edited by GSSP; 02/06/11.
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Joined: Jan 2011
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Campfire Member
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Campfire Member
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A hunter gets his deer. A good hunter can make long shots. A great hunter likes it up close and personal!
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Campfire Regular
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Campfire Regular
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Murphy was a grunt.
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