Krieger gain Twists

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As some of you may be aware, there is a small but dedicated following of progressive or "Gain Twist" barrels (For those unfamiliar with the concept, the area closest to the action has a slower rate of twist, but progressively gets tighter towards the muzzle end.)

Are these barrels more accurate? I don't know. Gain twisting is one of those things that a select group of die-hard fanatics swear-by. I think if "you have to ask", you probably wouldn't ever see the difference, but this rifling is available for those that want it!

Gain twisting is available in Krieger 6mm barrels, .236 0r .237 in 4 or 6 groove configurations.

The following twists are available for order at no additional cost:

6mm 9-8.5"

14.2 -13.6"

14.6- 13.8"

15-14.2"
 
Ian,
is the point of the sliding twist rate to give a wider range of bullet weights that the barrel can stabalise or is the concept just better at stabalising bullets in general.

Sorry if this is a daft question.
 
The origins of gain twisting go back to the black powder days where bullet tolerances were 'generous' and lead was soft, it was believed that by continually increasing the twist, the bullet was never going to become loose in the rifling as it is always being pushed up against an ever-increasing rate of twist. Is this true? I don't know. Never been proven one way or the other.

The other thoughts are that gain twists are more impervious to harmonics and may be more forgiving.

There are anecdotes that gain twists are more forgiving with vertical dispersion.

I don't know that either, The fact is that like most things in shooting, someone probably had one that shot very well and based on the fact it HAPPENED to be gain twisted, that became the latest magic bullet.

Lester Bruno has been having tremendous success with these and has done all the R&D on them. The 14.2-13.6 has been performing very well in short range benchrest.

On the R&D front, in response to demand, they may start producing 5R rifling for their barrels. Again, I am unconvinced this achieves anything substantive, however some guys have to have it and it sounds like it will soon be available.

Cheers,

Ian
 
I only have experience with one gain twist barrel. Ron Smith rebored and rechambered a Husqvarna 7mm Rem Mag to 358 Norma Mag. 1:24 to 1:14 gain, it is the most accurate 358 I have ever shot.

Ted
 
In the interest of SCIENCE and to add to the R&D of Krieger barrels I will, at absolutely NO CHARGE WHATSOEVER, test a gain twist verses my standard 8 twist barrel just for you.

Just take one of the gain twist barrels to Mick and have him chamber it and twist it on one of my actions.

Remember, I will do this for SCIENCE and to add further R&D to see if a gain twist barrel is in fact more accurate than a standard non-gain twist barrel and I will publish my findings on this very site. Keep an eye out here for my findings.

I will of course hate every damn minute of this experimentation but I am willing to "Take one for the team".





















































































;):D:D;):D;):D;):D;):D;):D:p
 
Gain twist????????

Well I've shoot beside fellows using the G/T barrels, I didn't see them to be any more accurate than a standard barrel. With that in mind, I would not be convinced to try one.
Bill
 
Why not? said:
I only have experience with one gain twist barrel. Ron Smith rebored and rechambered a Husqvarna 7mm Rem Mag to 358 Norma Mag. 1:24 to 1:14 gain, it is the most accurate 358 I have ever shot.

Ted
Click to expand...

X1
What I have found is that Smith gain twist barrels maintain their accuracy longer.
Example...
My Sako 22-250,
the OAL cannot be measured as the throat is eroded to such an extent that it is impossible to make a cartridge long enough to touch or come close to the lands. As a matter of fact a bullet that is another 0.25 inches longer would be needed.
This barrel still groups under 0.5 inches consistently. According to my records there have been 7500 rounds through it.
 
With the very excellent groups often posted from conventionally rifled barrels, I think it is all but impossible to PROVE the advantage of gain twist rifling. Perhaps if an experiment were concocted with machine rest test barrels etc?

In any case, the quality of those Krieger barrels speaks for itself.
 
CyaN1de said:
In the interest of SCIENCE and to add to the R&D of Krieger barrels I will, at absolutely NO CHARGE WHATSOEVER, test a gain twist verses my standard 8 twist barrel just for you.

Just take one of the gain twist barrels to Mick and have him chamber it and twist it on one of my actions.

Remember, I will do this for SCIENCE and to add further R&D to see if a gain twist barrel is in fact more accurate than a standard non-gain twist barrel and I will publish my findings on this very site. Keep an eye out here for my findings.

I will of course hate every damn minute of this experimentation but I am willing to "Take one for the team".
Click to expand...

Such selflessness, such... nobility. :p
 
When I first heard of gain twist rifling being available in custom barrels from Ron Smith I wanted to find out more because to my way of thinking the concept of a bullet entering a gentle twist and which then gains faster as it progresses down the bore sounds reasonable. But when I discovered that there is such little practical difference between the rate of twist from the lead to the muzzle I began to wonder what all the fuss was about. I'll stick with a conventional rate of twist thank you.
 
Boomer, I happen to agree. I have barrels that produce groups that would make any SRBR shooter envious out of my 6BR's. I frankly cannot see how that can be improved upon. Normal profile rifling and linear twists are working just fine thank you.

group.jpg
 
I purchase a gain twist from Ron Smith and had a look at his rifling machine. Home made and very ingenious.
My 6br is 15-1 to 8-1. I haven't shot it much still working the load up. Does look like a keeper though.
This is the first chamber I cut with this reamer and flush system so I started at 27g of varget, 105 bergs I tried out 28g and all's well. At 28g I am just about up to 2900. It looks like its on par with most barrels.
From what I have read and understand the gain twist may reduce chamber pressure as well. I thought I would try one out. The next I may try a regular 8-1 twist.

Happy shooting.
Stephen
 
28 grains of Varget at 2900 fps???

Things that make you go hmmmmmmmm. Love to know what the air guage measurement of that unlapped bore really is.
 
I think the average was about 2850 ish. And I think Ron reams at .236. Just a number that comes to mind. He has a nice deep hole drilling machine carbide deep hole drills and carbide reamers. Drills on one side and reams on the other Looks top notch. Air guage I don't think he does
I will record some of the chrono readings next time Im at it.

Stephen
 
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