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Paul31
Guest
Don't know if this is in the right forum. Is there a place you can find recommended rifle twists for calibers and bullet weights?
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kenny46
Guest
paul31 Try kreigers webb page
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Dennis Sorensen
Guest
Back on the home page of Benchrest Central there are all sorts of links to click on...
Here is one: http://www.shilen.com/calibersAndTwists.html
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expiper
Broken down Plumber
ask on here!!
There are folks on here that shoot just about every thing from soup to nuts...12 cal to 20mm!!!....every bullet known to man....if you will say what you intend to do with the gun....cal....bullet...distance...etc....you will get several very good answers ....and the wrong ones will be weeded out.....lots of times bullet manufactures and bbl manufactures err on the conservative side....these shooters are not conservitive...they use and reccomend wht works for them....not what they heard from someone else....Roger
There are folks on here that shoot just about every thing from soup to nuts...12 cal to 20mm!!!....every bullet known to man....if you will say what you intend to do with the gun....cal....bullet...distance...etc....you will get several very good answers ....and the wrong ones will be weeded out.....lots of times bullet manufactures and bbl manufactures err on the conservative side....these shooters are not conservitive...they use and reccomend wht works for them....not what they heard from someone else....Roger
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abintx
Guest
Here's twist info for the centerfire .224 caliber ...
This is from the Shilen web page www.shilen.com:
"The information below will help you select the best barrel twist for your specific needs, providing of course there are multiple choices. If you’ll be shooting one bullet weight, choose a twist from the chart just fast enough to stabilize it. Too fast a twist simply overspins the bullet and may result in reduced accuracy. On the other hand, a twist too slow for any bullet will likely produce instability, keyholing and rotten accuracy. So if you’re going to be using several bullet weights, be sure to select a twist that will stabilize the heaviest one, since lighter bullets will also be stabilized.
By way of explanation, the numbers in the "Twist" column indicate how far the bullet must travel through the bore to make one full revolution. This is determined by the rate of rotation of the rifling. For example, a 9"-twist barrel spins the bullet one full turn when it passes 9 inches through the bore. In a 16"-twist barrel, the bullet makes one revolution in 16 inches. So at the same bullet velocity, the 9" twist is faster (spins the bullet faster) than the 16" twist. Consequently, as the chart reflects in the .224 CF section, the 9" twist is necessary for stabilizing heavier bullet weights.
Again looking at the .224 CF section, if you’re planning to shoot 55-grain bullets, the 14" twist is ideal. This twist is also the best choice for 52- and 53-grain match bullets driven at moderate velocities. But if you’re also contemplating shooting a 60-grainer, go with the 12" twist, since it will stabilize all the bullets you’ll be using. As you can see from the 15" and 16" twists, higher velocities also spin the bullet faster and may enable a slower-than-recommended twist to stabilize a marginally overweight bullet. However, this is tricky stuff best left to those who are highly experienced in operating at the ragged edge of stability and sanity.
The basic principles just outlined apply to all the calibers below. But, if you have questions or need a recommendation, let us know."
.224 CF Caliber Twist
8" For bullets heavier than 70 gr.
9" For bullets up to 70 gr.
12" For bullets up to 63 gr.
14" For bullets up to 55 gr.
15"* For bullets up to 55 gr. driven 4,100 fps or more
16"* For bullets up to 55 gr. driven 4,300 fps or more
This is from the Shilen web page www.shilen.com:
"The information below will help you select the best barrel twist for your specific needs, providing of course there are multiple choices. If you’ll be shooting one bullet weight, choose a twist from the chart just fast enough to stabilize it. Too fast a twist simply overspins the bullet and may result in reduced accuracy. On the other hand, a twist too slow for any bullet will likely produce instability, keyholing and rotten accuracy. So if you’re going to be using several bullet weights, be sure to select a twist that will stabilize the heaviest one, since lighter bullets will also be stabilized.
By way of explanation, the numbers in the "Twist" column indicate how far the bullet must travel through the bore to make one full revolution. This is determined by the rate of rotation of the rifling. For example, a 9"-twist barrel spins the bullet one full turn when it passes 9 inches through the bore. In a 16"-twist barrel, the bullet makes one revolution in 16 inches. So at the same bullet velocity, the 9" twist is faster (spins the bullet faster) than the 16" twist. Consequently, as the chart reflects in the .224 CF section, the 9" twist is necessary for stabilizing heavier bullet weights.
Again looking at the .224 CF section, if you’re planning to shoot 55-grain bullets, the 14" twist is ideal. This twist is also the best choice for 52- and 53-grain match bullets driven at moderate velocities. But if you’re also contemplating shooting a 60-grainer, go with the 12" twist, since it will stabilize all the bullets you’ll be using. As you can see from the 15" and 16" twists, higher velocities also spin the bullet faster and may enable a slower-than-recommended twist to stabilize a marginally overweight bullet. However, this is tricky stuff best left to those who are highly experienced in operating at the ragged edge of stability and sanity.
The basic principles just outlined apply to all the calibers below. But, if you have questions or need a recommendation, let us know."
.224 CF Caliber Twist
8" For bullets heavier than 70 gr.
9" For bullets up to 70 gr.
12" For bullets up to 63 gr.
14" For bullets up to 55 gr.
15"* For bullets up to 55 gr. driven 4,100 fps or more
16"* For bullets up to 55 gr. driven 4,300 fps or more
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Paul31
Guest
thanks guys.....
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Alan Peake
Guest
Twist Data
Paul, I have measured a number of bullets and used a ballistics program to calculate stabilty factor for a given twist and required twist for a stability factor of 1.5
You can download it from www.users.on.net/~adpeake/brest/tech.htm
Look for bprof.xls
Alan
Paul, I have measured a number of bullets and used a ballistics program to calculate stabilty factor for a given twist and required twist for a stability factor of 1.5
You can download it from www.users.on.net/~adpeake/brest/tech.htm
Look for bprof.xls
Alan
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