Can someone explain the need for gain twist rifling?

[Rocketvapor]

Popping the clutch on a fast twist vs a little slower spin up?

 

[Uthink Uknow]

Makes sense to me Dave. It also seems to me that changing the twist in a barrel does change the engraving on the bullet ever so slightly but just the same changes it. What does that do to velocity? I’m just an uneducated guy and don’t really see the benefit of gain twist. Just another figure in the equation of life. And by the time you figure this barrel out it will be time for another barrel and a new set of figures.Oohhh my head hurts.

 

[golong]

Listening to the guys that are actually shooting gain twist, the biggest advantage is they can shoot different weight bullets with minimal to no difference in zero.

 

[DirtySteve]

All Rock Creek barrels are gain twist....

 

[Rdlningcltchdmpr]

I am curious why some shooters swear by it while others are waiting to try it out. What advantage and are there any cons. Just trying to learn.

What about choke, I've heard tell if a barrel has a slight choke in the last inch it can improve accuracy.

 

[Dusty Stevens]

All Rock Creek barrels are gain twist....

Not on purpose

 

[DirtySteve]

Not on purpose

True the machines they use, Pratt & Whitney I believe, were set up that way when they were originally made. Or so I was told. This was years ago so the details are a bit fuzzy, much like my slippers..

Edit...This applies to the cut rifle barrels only.. Not the button..

 

[Dusty Stevens]

True the machines they use, Pratt & Whitney I believe, were set up that way when they were originally made. Or so I was told. This was years ago so the details are a bit fuzzy, much like my slippers..

No i mean they make non gain twists

 

[DirtySteve]

It is my understanding that the cut barrels gain .5 to .75 of twist rate due to the machines used. I could care less as long as they shoot well, and all mine do... I have four... Actually the jury is still out on my Creedmoor. My loose scope base made me bang my head.. I have yet to retest it..

Edit: It is a Creedmoor so it will have to shoot sub .5 MOA ALL DAY LONG!!

 

[Monte F]

It is my understanding that the cut barrels gain .5 to .75 of twist rate due to the machines used. I could care less as long as they shoot well, and all mine do... I have four... Actually the jury is still out on my Creedmoor. My loose scope base made me bang my head.. I have yet to retest it..

Edit: It is a Creedmoor so it will have to shoot sub .5 MOA ALL DAY LONG!!

A loose scope base should not effect a Creedmoor's accuratecy!

 

[Dusty Stevens]

It is my understanding that the cut barrels gain .5 to .75 of twist rate due to the machines used. I could care less as long as they shoot well, and all mine do... I have four... Actually the jury is still out on my Creedmoor. My loose scope base made me bang my head.. I have yet to retest it..

Edit: It is a Creedmoor so it will have to shoot sub .5 MOA ALL DAY LONG!!

Im glad you clarified that. For a minute i thought you were losing it. You forgot to add in “if you do your part”

 

[DangerRanger]

It is my understanding that the cut barrels gain .5 to .75 of twist rate due to the machines used. I could care less as long as they shoot well, and all mine do... I have four... Actually the jury is still out on my Creedmoor. My loose scope base made me bang my head.. I have yet to retest it..

Edit: It is a Creedmoor so it will have to shoot sub .5 MOA ALL DAY LONG!!

that’s what they told me when I called them to talk about their barrels when I agreed to use my first one on my next rifle

I’ve never had a gain before, I doubt I’ll become enamored with having to only have gains in the future. I have a funny feeling that in itself is not nearly as important as the lathe runner and the tuner and then many other variables.

 

[Jason_A]

Not on purpose

Good point

 

[jonbearman]

I am grateful for the feedback on this issue.

 

[LC Tikka]

My wallet has reverse twist put a hundred in and fifty comes out, tested this many times.

 

[Shawnba67]

My wallet has reverse twist put a hundred in and fifty comes out, tested this many times.

Try flipping it over!

 

[243winxb]

Keeps bullets from skidding.

 

[X-Caveman]

All Rock Creek barrels are gain twist....

I asked Russell at Rock Creek. Here's his response, shared with his permission.

"Travis,

The gain twist starts about 14" from the end of the blank that we send,
so on a 29" blank it starts about 15" from the breech face, this could
change based on if/how much material is removed from the breech when the
barrel is fit to the receiver.

The gain on most barrels is about .2, if the twist is faster is will be
a little more, if it's slower it will be a little less, the barrels
typically have no more than .3 and no less than .1 gain, so it's a very
small amount.

The gain will always be faster than the twist marked on the barrel, for
example on an 8 twist barrel, we will never start at an 8.2 twist and
work up to 8.0, it will start at 8.0 and end up 7.8.

We are using Pratt and Whitney riflers that have been modified so we are
able to run gain twist and there's also an internal modification that
removes all backlash from the tooling, so as stuff wears, the "slop"
created will never have an impact on the internal rifling of the barrel.

I hope this answers all of your questions.

Russell

Rock Creek Barrels"

I'll add two more points that Russell has told me in conversation... He cautions against an aggressive gain twist, at least in a premium lapped barrel. If the gain is too dramatic, it's tough to lap the bore without altering the land/groove geometry (ever so slightly). He also has told me to think Rock's slight gain as a choke of sorts, rather than a traditional gain twist.

We have a decent inventory at the moment for those that want to try one. To my knowledge we are the only stocking dealer in these targeting the benchrest & F-Class crowds.
https://fieldandcaveoutfitters.com/collections/rock-creek-barrels

 

[best defense]

I am curious why some shooters swear by it while others are waiting to try it out. What advantage and are there any cons. Just trying to learn.

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I did a little research last year on the gain twist barrels. It seems that the gain twist is easier on bullets so they are more likely to maintain the integrity of their jackets, but as far as I have been able to determine there is not any verifiable evidence that the gain twist is any more or less accurate than other rifling.