gain twist


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gain twist

[′gān ‚twist]
(ordnance)
A type of rifling in which the twist is more rapid at the muzzle than at the breech, thus gradually increasing the rotation of the projectile.
References in periodicals archive ?
These gains assume the rifle is barreled with the stellar Bartlein 5R gain twist (1:13-1:6.
A gain twist barrel engraves and spins the bullet up gradually.
By this time Bartlein was also offering gain twist barrels.
The benefit of gain twist in an extreme high-pressure/high-velocity modern revolver like the M460XVR is similar in that it allows the bullet to transition into the rifling more slowly from a nonrotating state instead of being forced to "spin up" instantly when it crosses the barrel/cylinder gap and slams into the rear of the barrel at the very instant deformation potential is at its height.
One of the intriguing aspects of the trials was that the Commission had decided to use a gain twist barrel to over-come the effects of throat erosion.
Gain twist barrels beginning with a slow twist and incrementally increasing toward the muzzle should last longer than barrels with uniform fast twists.
Though this goes into theories of why gain twist barrels seem to shoot so well, I did not cover gain twist for Palma.
That, coupled with my gain twist barrel design, allows me to hit my target muzzle velocity of 2,600 fps with Berger 90 grain boat tails and stay strong supersonic (1,249 fps remaining) out to 1000 yards.
To get those long, heavy bullets moving out of the throat faster you may want a gain twist barrel.
I am working with Bartlein on a gain twist that begins with 1:13" at the chamber and doubles to the muzzle where it hits a final 1:6.