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Old February 18, 2013, 10:57 PM   #1
cdbeagle
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Rifling Twist for 6.5x55

I have a CZ 550 American in 6.5x55. The rate of twist is 1:9. All I have ever shot through it is PRVI 139 grain. The rifle shoots this ammo very accurately. I am planning on trying some other ammo that is higher velocity in 140 grain. I have read that the 1:9 twist in my rifle won't stabilize 140 grain bullets. It seems to do well with the PRVI though. What are your thoughts?
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Old February 18, 2013, 11:28 PM   #2
taylorce1
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It may not stabilize 140 solid copper or vld bullets but it will probably be fine for standard cup-n-core bullets. The only way to know for sure though is to shoot a variety of 140's to find out what you're rifle likes.
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Old February 18, 2013, 11:38 PM   #3
reynolds357
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My CZ550 6.5X55 shoots 140 bergers very accurately. If will stabilize a 140 Berger, I would venture it would stabilize all 140's.
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Old February 19, 2013, 12:02 AM   #4
cdbeagle
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Thanks guys, I am fixing to start reloading(waiting for the equipment to arrive) and thinking about the Hornady SST 140 grain as the first bullet to try. Have you tried them and if so how was the accuracy?
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Old February 19, 2013, 10:19 AM   #5
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I always fall back on Dan Lilja's FAQ for twist rates:

http://www.riflebarrels.com/faq_lilj...#twist%20rates

According to him, 1 in 9 in .264 will work for 140 gr bullets. My 6.5-06 is 1:9 and shoots 140s just fine.
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Old February 19, 2013, 11:43 AM   #6
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Use the "bible", here:

http://www.jbmballistics.com/cgi-bin/jbmstab-5.1.cgi

Quote:
thinking about the Hornady SST 140 grain as the first bullet to try
Good BC for a hunting application, not as good as the A-Max, but still above .5.

I just noticed they introduced a 123 grain SST- perfect for our 6.5 Grendel!
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Old February 19, 2013, 01:42 PM   #7
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Shoot the Berger. My 550 for some reason only likes extreme boat tails. Example Berger and A-max.
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Old February 19, 2013, 02:48 PM   #8
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My 6.5-06, 9", shoots 140 Hornady and SGK wonderfully.
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Old February 19, 2013, 03:07 PM   #9
cdbeagle
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Thanks for all the advice. I could not find the Berger Hunting VLD in 140 Grain anywhere so I ordered them in 130 grain.
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Old February 19, 2013, 07:14 PM   #10
reynolds357
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It shoots the 130 equally well. I used to shoot them in it, but I started buying the 140's in bulk because of my 6.5X284 1000 yard rifle. Touch the bullet to the lands.
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Old February 20, 2013, 03:08 AM   #11
cdbeagle
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Thanks.
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Old February 21, 2013, 12:10 PM   #12
Olorin
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"I have read that the 1:9 twist in my rifle won't stabilize 140 grain bullets."

The old Swedish Mausers M96 had a twist of 1-8.66. I shoot 160 grain Hornady rounds and they group at just over an inch.
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