Rifle twist,what is difference
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Old 10-03-2012, 09:51 PM   #1
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Default Rifle twist,what is difference

Whats the shooting difference between a 1in 7 or a 1in 9 twist barrel.

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Old 10-03-2012, 09:55 PM   #2
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One complete revolution of the bullet in 7 inches of forward travel versus one complete revolution in 9 inches of forward travel.

Did you mean specifically as in which grain bullet are they best suited for? Or in terms of accuracy?

The 1 in X number is just how long "X" in inches it takes the bullet to make a 360 revoluation inside the barrel. 1:12? 12 inches.

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Old 10-03-2012, 10:07 PM   #3
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101,

Dillinger is correct. If you would like to look into it further. Go to the above Search Box and type in Barrel Twist and hit GO.
Then scan down the topics and you will see a section titled "Understanding Barrel Twists" Maybe that will also help.

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Old 10-04-2012, 12:23 AM   #4
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2" is all.

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Old 10-05-2012, 03:28 AM   #5
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Thanks ,thats a big help.l guess what l was really going after was wondering which one would be the better shooter at say 100 yds.or would either be better ?

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Old 10-05-2012, 03:30 AM   #6
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What grain round? What "bullet" are you shooting?

What ammo are you going to buy and shoot for 100 yard accuracy?

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Old 10-05-2012, 03:31 AM   #7
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Quote:
Originally Posted by hoghappy101 View Post
Thanks ,thats a big help.l guess what l was really going after was wondering which one would be the better shooter at say 100 yds.or would either be better ?
Different grains for different twists...

http://www.firearmstalk.com/forums/f20/understanding-barrel-twist-bullet-weights-44557/
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Old 10-05-2012, 03:37 AM   #8
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Not really planning on shooting any certain ammo or grain . The question was really to settle in my my if the barrels would shoot different. Besides just a bullet spinning more or less.

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Old 10-05-2012, 03:53 AM   #9
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If you don't match up the bullet with your rifling twist rate then you can get bad performance. Over stabilizing a bullet with a faster twist rate doesn't cause many problems. But, not stabilizing the bullet can cause bullets to wobble or flip and tumble in flight ruining consistent flight paths for any kind of repeatable accuracy.

So I wouldn't shoot bullets over 62 grains out of a 1:12 barrel or anything much heavier than 70 gr out if a 1:9 twist and expect lo g range accuracy when dei g with .223 caliber projectiles.

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Old 10-05-2012, 04:13 AM   #10
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As the folks have said- the rate of twist has to be correct for the weight and length of the bullet.

I shoot a 400 grain 50 caliber muzzleloader with a twist of about 1 in 42 inches. If the barrel had the rate of twist of an AR15, the big soft HEAVY bullet would skid over the rifling instead of being spun by it.

Likewise, a bullet that needs a fast rate of twist for stability (1 in 7 inches) if fired from a 1 in 42 would probably be traveling sideways or backwards.

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