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Ask Ian: Progressive Twist (Gain Twist) in Small Arms? (ad-free) (Patreon)

Published:
2022-07-21 12:01:02
Imported:
2022-07

Content

From Jamie on Utreon:

"I know naval gatling guns like the 20mm CIWS uses gain twist rifling, but are or were there any commercial or military small arms that used gain twist rifling?"

Yes, there have been some significant uses of progressive (gain) twist rifling on military and civilian small arms. These include:

Colt percussion revolvers (1848, 1849, 1851, 1860, 1861 models)

Custom barrels for Sharps, Stevens, and other rifles by Harry Pope

Carcano Model 1891 rifles and carbines

S&W .460 XVR revolvers

There are certainly others, but those are some of the most significant.

Files

Ask Ian: Progressive Twist (Gain Twist) in Small Arms? (ad-free)

https://utreon.com/c/forgottenweapons/ http://www.patreon.com/ForgottenWeapons http://www.floatplane.com/channel/ForgottenWeapons Cool Forgotten Weapons merch! http://shop.forgottenweapons.com From Jamie on Utreon: "I know naval gatling guns like the 20mm CIWS uses gain twist rifling, but are or were there any commercial or military small arms that used gain twist rifling?" Yes, there have been some significant uses of progressive (gain) twist rifling on military and civilian small arms. These include: Colt percussion revolvers (1848, 1849, 1851, 1860, 1861 models) Custom barrels for Sharps, Stevens, and other rifles by Harry Pope Carcano Model 1891 rifles and carbines S&W .460 XVR revolvers There are certainly others, but those are some of the most significant. Contact: Forgotten Weapons 6281 N. Oracle 36270 Tucson, AZ 85740

Comments

Jim F

Gain twist barrels have been made by various makers also over the years. Wil Schumann is the sole modern producer- handgun barrels- for the commercial market I'm aware of. I think that there's alot to be said for the idea. It is a more expensive procedure of rifling, perhaps best suited for hammer forging, but I'd like to see some dedicated testing and comparison done between the two using jacketed and cast lead. Great piece, Ian! You've no idea how close to indispensable you are to the shooting community.

Terry

Really informative.

Anonymous

Some British anti aircraft guns used variable depth rifling. It's known as Probert rifling it's deep groove at the breech becoming smooth bore by the muzzle. Special shells with a groove behind the rifling band were used the rifling band was squashed back into the groove giving a more streamlined shell for faster time to altitude.

Anonymous

Perhaps as a supplement to Ian's interesting story on gained twist the following. Another way to express the rate of twist of the rifling is the angle that the grooves make with the barrel axis. When a projectile is fired, it can be seen by the impressions of the lands and grooves, which are formed in an angle with the projectile axis, depending on the twist rate. With a progressive twist rifling, this angle varies from the degree of the slower starting of the twist of the rifling to the degree at the fastest part of the twist. This means that during the passage through the bore a kind of machining effect can take place on the projectile surface. Hence, progressive pitch is mostly used in projectiles with a guide band or round ball bullets with a minimal contact surface with the barrel bore.

nick smith

Please keep doing these type of videos in the future! they are so good, I love hearing more detail about all these questions. I understand this is probably a lot more work than your traditional Q&A's, but that extra work really shows.

D Haire

Another great video Ian! Never heard or read anything about this type of twist. Makes sense in some applications. Looking forward to the next Q&A video!

Guido Schriewer

as long as it works... why not

Anonymous

FWIW, some British WW2 AA-guns had rifling of a progressively diminishing depth - rifled at the breech, smoothbore at the muzzle. Less friction as the shell accelerates.

Anonymous

That shirt is deeply hilarious. At first glance it's covered with lotus flowers but on a closer look it's really explosions with helicopters and B-52's in the background.

Anonymous (edited)

Comment edits

2022-08-26 21:22:53 Wouldnt the Rogeurs and Spenceur(maybe a french style of spelling will get you doing it hehehe) revolver would be an interesting topic for a video? I noticed that even among blackpowder shooters there are people who dont know R&S revolvers.
2022-07-23 08:07:33 Wouldnt the Rogeurs and Spenceur(maybe a french style of spelling will get you doing it hehehe) revolver would be an interesting topic for a video? I noticed that even among blackpowder shooters there are people who dont know R&S revolvers.

Wouldnt the Rogeurs and Spenceur(maybe a french style of spelling will get you doing it hehehe) revolver would be an interesting topic for a video? I noticed that even among blackpowder shooters there are people who dont know R&S revolvers.