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264 twist rate and bullet choices

 
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Old 11-22-2012, 02:40 PM
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264 twist rate and bullet choices

after doing some inconclusive load developement with a 264 win mag, i noticed that berger recoments a 1:8 twist rate for their 140gr pill, while my rifle has a 1:9 twist. have i been wasting my time with a bullet that wont stabilize in my rifle?
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Old 11-22-2012, 02:45 PM
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Re: 264 twist rate and bullet choices

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Originally Posted by fisherman983 View Post
after doing some inconclusive load developement with a 264 win mag, i noticed that berger recoments a 1:8 twist rate for their 140gr pill, while my rifle has a 1:9 twist. have i been wasting my time with a bullet that wont stabilize in my rifle?
Are you testing at 200+meters? Did you do a seating depth test after your ladder test? I would think the 130g would be better suited to you twist rate.
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Old 11-22-2012, 02:47 PM
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Re: 264 twist rate and bullet choices

testing at 100 yds, did not do a seating depth or ladder test
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Old 11-22-2012, 03:19 PM
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Re: 264 twist rate and bullet choices

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Originally Posted by fisherman983 View Post
testing at 100 yds, did not do a seating depth or ladder test
OK well 100m is not enough to tell if the bullet has settled down. If you have not done either of them then yes your wasting bullets, regardless of whether or not the bullet will stabilize.
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Old 11-22-2012, 07:55 PM
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Re: 264 twist rate and bullet choices

You're probably fine in 9tw Fisherman.
Berger recommends an optimum twist under ICAO conditions(same conditions of BC rating). Seal level, 59deg, 0%Rh.
8tw puts the 140VLD Sg at or above 1.5 here, and this provides margin for all things affecting stability.

9tw puts Sg about ~1.3 at ICAO and there is no evidence yet that this would degrade accuracy for you. It might if your muzzle pressures are in excess(short barrel), or your crown is less than perfect.
What conditions will you be shooting in(elevation, temps)?

I've used 140VLDs in 8.5tw here at sea level, and around 50degs with fine performance.
My Sg is typically running ~1.4
I personally would not worry about 9tw unless I was challenging stability in another regard.
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Old 11-22-2012, 08:23 PM
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Re: 264 twist rate and bullet choices

shooting conditions will be typical oregon coastal weather, temps in the 40's and 50's with lots of rain and elevatoin from 0-1500 ft with occaisional trips to other states such as wyoming and hopefully trips to montana and idaho and anywhere else i may be luck enough to draw a tag as well with shooting conditions unknow at those locations
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Old 11-22-2012, 11:05 PM
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Re: 264 twist rate and bullet choices

I never had a problem in my 264 win mag sendero which is a 9 twist. I also shoot the 140 bergers in a 6.5-06 8.5 twist. They are much more accurate in that rifle but I assume that is because it is a custom.
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