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Feb 12th, 2024
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 what is twist rate?
#656625
03/31/09 04:49 AM
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Joined: Oct 2008
Posts: 252
honcho
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Bird Dog
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Bird Dog
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can anyone explain this in "dumb-dumb" terms?
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Re: what is twist rate?
[Re: honcho]
#656626
03/31/09 04:56 AM
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Joined: Nov 2007
Posts: 13,735
helomech
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It is how many inches of travel before a bullet rotates on time. A 1:7 twist will rotate the bullet one time in 7 inches.
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Re: what is twist rate?
[Re: helomech]
#656627
03/31/09 05:28 AM
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Joined: Oct 2008
Posts: 252
honcho
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Bird Dog
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Re: what is twist rate?
[Re: honcho]
#656628
03/31/09 05:39 AM
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Joined: Nov 2004
Posts: 44,585
RKHarm24
sergeant
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sergeant
Joined: Nov 2004
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Re: what is twist rate?
[Re: RKHarm24]
#656629
03/31/09 04:06 PM
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Joined: Jan 2009
Posts: 233
JVaught
Woodsman
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Woodsman
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Generally, the heavier the pill you're gonna sling, the faster the twist you'll need. But you CAN over-spin a bullet. You can litterally spin the jackets off of them if you push a really light bullet down a fast twist barrel to quickly. On the flip side, if you don't spin it fast enough for it's weight, you'll have degraded accuracy...especially at longer distances.
What caliber and bullet are you shooting?
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Re: what is twist rate?
[Re: honcho]
#656630
03/31/09 07:26 PM
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Joined: Nov 2007
Posts: 13,735
helomech
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Quote:
i see, thanks helomech
Your welcome.
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Re: what is twist rate?
[Re: JVaught]
#656631
03/31/09 11:51 PM
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Joined: Nov 2005
Posts: 10,658
Greg
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Quote:
Generally, the heavier the pill you're gonna sling, the faster the twist you'll need.
Yeah... it's really the length of the bullet (but I guess longer bullets tend to weigh more too)  They need a faster rate to stabiblize them better.
I had a noveske barrel for an AR that I built, and it was 1/7.5". It would shoot the 77 grain BTHP Black Hills to about .5 MOA if I did my part. When I would switch to the shorter and cheaper 55 grain rounds the groups were about an inch. 
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Re: what is twist rate?
[Re: JVaught]
#656632
04/01/09 04:48 AM
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Joined: Oct 2008
Posts: 252
honcho
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Bird Dog
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Bird Dog
Joined: Oct 2008
Posts: 252 |
Quote:
Generally, the heavier the pill you're gonna sling, the faster the twist you'll need. But you CAN over-spin a bullet. You can litterally spin the jackets off of them if you push a really light bullet down a fast twist barrel to quickly. On the flip side, if you don't spin it fast enough for it's weight, you'll have degraded accuracy...especially at longer distances.
What caliber and bullet are you shooting?
220 swift.........hornady 50gr. v-max moly
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Re: what is twist rate?
[Re: honcho]
#656633
04/01/09 07:12 PM
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Joined: Aug 2005
Posts: 838
uthornfan
Tracker
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Tracker
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Re: what is twist rate?
[Re: uthornfan]
#656634
04/02/09 05:15 AM
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Joined: Nov 2007
Posts: 6,203
Koenig
THF Trophy Hunter
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THF Trophy Hunter
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I have herd that shooting to fast ind a slow twist rate is extremely bad. like the bullet breaks apart in flight, however i dunno if that is true.
 never trust a man that rents pigs....
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Re: what is twist rate?
[Re: Koenig]
#656635
04/02/09 04:05 PM
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Joined: Jan 2009
Posts: 233
JVaught
Woodsman
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Woodsman
Joined: Jan 2009
Posts: 233 |
Gunnut, a 1/14 will probably do well for that bullet. You could spin a little faster if you thought you were gonna mix it up with some heavier bullets, but I wouldn't get down into the 1/12 area unless you're gonna handload big pills and slow 'em down.
I've never witnessed it, but I've had two people that I shoot competitively with and trust that have over-spun bullets and they were coming apart apart about 50 yards from the muzzle. But they were both pushing them really fast.
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