I overheard a conversation at the range about transitional rifling and was curious what it was and what it does..
Gunsmithing Transitional Rifling?
- Thread starter InTheWeeds
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Re: Transitional Rifling?
Google.com?
http://www.bartleinbarrels.com/Trifling.htm
Gain twist, starts slower and finishes faster.
Google.com?
http://www.bartleinbarrels.com/Trifling.htm
Gain twist, starts slower and finishes faster.
Re: Transitional Rifling?
Ok, so does this help prevent a bullet from coming apart in the barrel at high twist rates?
Ok, so does this help prevent a bullet from coming apart in the barrel at high twist rates?
Re: Transitional Rifling?
Nope, it has no effect on that behavior.
The exit twist and muzzle velocity are the determining factor as to whether or not a given bullet will come apart.
You can shoot a bullet in a 5 twist at 4000fps and it will not come apart WHILE IN THE BORE because the steel is supporting the jacket. As soon as that is gone and the bullet is in the air, it's going to do what the ultra high rpms will do. Poof.
Nope, it has no effect on that behavior.
The exit twist and muzzle velocity are the determining factor as to whether or not a given bullet will come apart.
You can shoot a bullet in a 5 twist at 4000fps and it will not come apart WHILE IN THE BORE because the steel is supporting the jacket. As soon as that is gone and the bullet is in the air, it's going to do what the ultra high rpms will do. Poof.
Re: Transitional Rifling?
So in other words, this rifling gradually brings bullet up to speed and increases the momentum of bullet going through twist by reducing amount of energy lost in early on spin and there fore increases velocity of bullet outside bore. This is the same theory as extraction in automotive exhaust technology for nascar, and F1. Very cool
So in other words, this rifling gradually brings bullet up to speed and increases the momentum of bullet going through twist by reducing amount of energy lost in early on spin and there fore increases velocity of bullet outside bore. This is the same theory as extraction in automotive exhaust technology for nascar, and F1. Very cool
Re: Transitional Rifling?
I think the theory is it more brings the rotational velocity of the projectile up to 'speed' more gradually as it drives thru the length of the barrel. Therefore creating less stress or upset on the projectile itslf.
I think the theory is it more brings the rotational velocity of the projectile up to 'speed' more gradually as it drives thru the length of the barrel. Therefore creating less stress or upset on the projectile itslf.
Re: Transitional Rifling?
Gain twist has no real effects on velocity or pressure levels. The main benefit is that by applying a small amount of increase in the twist rate, the bullet will be under constant resistance. It forms a physical choke, for lack of a better description. It appears that this will extend the secondary pressure curve slightly, and keep the barrel stretching forward for a longer period of time. This will dampen harmonic vibrations for a longer period of time and improve accuracy.
We have had the best results with a very small increase in twist rate, usually from .5 to 1.0 inch of increase in the twist rate over the length of a barrel. For example, a .308 Win would start at 12.0 twist and increase to 11.25 at the muzzle.
Some of the benchrest shooters that use our barrels have been experimenting with increases as small as .1 inch of increase with very good results.
Some ELR shooters have been experimenting with much more radical twist rates but as of yet no scientific results have been reported.
Gain twist has no real effects on velocity or pressure levels. The main benefit is that by applying a small amount of increase in the twist rate, the bullet will be under constant resistance. It forms a physical choke, for lack of a better description. It appears that this will extend the secondary pressure curve slightly, and keep the barrel stretching forward for a longer period of time. This will dampen harmonic vibrations for a longer period of time and improve accuracy.
We have had the best results with a very small increase in twist rate, usually from .5 to 1.0 inch of increase in the twist rate over the length of a barrel. For example, a .308 Win would start at 12.0 twist and increase to 11.25 at the muzzle.
Some of the benchrest shooters that use our barrels have been experimenting with increases as small as .1 inch of increase with very good results.
Some ELR shooters have been experimenting with much more radical twist rates but as of yet no scientific results have been reported.
Re: Transitional Rifling?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Brutas</div><div class="ubbcode-body">Gain twist has no real effects on velocity or pressure levels. The main benefit is that by applying a small amount of increase in the twist rate, the bullet will be under constant resistance. It forms a physical choke, for lack of a better description. It appears that this will extend the secondary pressure curve slightly, and keep the barrel stretching forward for a longer period of time. This will dampen harmonic vibrations for a longer period of time and improve accuracy.
We have had the best results with a very small increase in twist rate, usually from .5 to 1.0 inch of increase in the twist rate over the length of a barrel. For example, a .308 Win would start at 12.0 twist and increase to 11.25 at the muzzle.
Some of the benchrest shooters that use our barrels have been experimenting with increases as small as .1 inch of increase with very good results.
Some ELR shooters have been experimenting with much more radical twist rates but as of yet no scientific results have been reported. </div></div>
Oh Cool. Understood. I hadn't thought of it in this outlook.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Brutas</div><div class="ubbcode-body">Gain twist has no real effects on velocity or pressure levels. The main benefit is that by applying a small amount of increase in the twist rate, the bullet will be under constant resistance. It forms a physical choke, for lack of a better description. It appears that this will extend the secondary pressure curve slightly, and keep the barrel stretching forward for a longer period of time. This will dampen harmonic vibrations for a longer period of time and improve accuracy.
We have had the best results with a very small increase in twist rate, usually from .5 to 1.0 inch of increase in the twist rate over the length of a barrel. For example, a .308 Win would start at 12.0 twist and increase to 11.25 at the muzzle.
Some of the benchrest shooters that use our barrels have been experimenting with increases as small as .1 inch of increase with very good results.
Some ELR shooters have been experimenting with much more radical twist rates but as of yet no scientific results have been reported. </div></div>
Oh Cool. Understood. I hadn't thought of it in this outlook.
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