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Variable Rifling [Vanity]
Self ^ | 11 Apr 10 | Self

Posted on 05/14/2010 8:23:57 PM PDT by OneWingedShark

I was wondering about gun-smithing recently. Particularly rifling; I don’t know anything about the actualities of smithing, so it’s pure conjecture on my point.

Given a rifled barrel, they have constant rifling rates, is it possible to make ‘varying rate’ barrels.
Would such a varying rate reduce the wear on barrels?
To help clarify what I'm trying to get at, here are some pictures.

A constant rifling of 2 rotations per unit-length.

A variable rifling [ignore the negative portions] which starts at '0' {the rifling being parallel to the major axis of the barrel} to '8' which is the desired rate of spin to impart to the bullet. (with constant rate-of-change)

A variable rifling which changes at a varying rate-of-change, instead of a constant.


TOPICS: Chit/Chat
KEYWORDS: banglist; gunsmithing
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To: HiTech RedNeck
Are short guns ever rifled?

By "short guns" you mean handguns? Yes. As far as I know, they all are. About the only type non rifled gun is a shotgun because what good would it do all the shot, but even with a shotgun if you fire a slug, which would benefit from rifling, there's rifling on the slug instead of the barrel.

21 posted on 05/14/2010 8:57:36 PM PDT by Still Thinking (Freedom is NOT a loophole!)
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To: plinyelder

>No need to get defensive.

Ah; sometimes I’m accused of being argumentative in my queries. I guess it could be construed as ‘defensive’ as well.

...maybe I can fit ‘offensive’ in there and it’ll be a hat-trick.
;)


22 posted on 05/14/2010 9:00:50 PM PDT by OneWingedShark (Q: Why am I here? A: To do Justly, to love mercy, and to walk humbly with my God.)
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To: OneWingedShark

>>>Why ‘bite my tongue’?<<<

Wasn’t meant as you took it... I have to bite my tongue to keep from calling progressives/liberals additional names.(political)

Second post referred to military ritual - ‘this is my rifle, this is my gun - this is for business and this is for fun.’

Hence, in my slap-happy mood tonight, I was sorely tempted - Well, maybe the ambien kicking in had some effect - time to turn in...

Sorry if you were offended - point was that some gun makers have over the years experimented and produced rifles with progressive lands and grooves - more turns near the muzzle than at the breach. The practice has pros and cons.


23 posted on 05/14/2010 9:08:52 PM PDT by DelaWhere (Better to be prepared a year too early than a day too late.)
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To: OneWingedShark

Inconceivable!


24 posted on 05/14/2010 9:09:28 PM PDT by Vendome (Don't take life so seriously... You'll never live through it.)
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To: DelaWhere

Nah, I wasn’t really offended; just puzzled.


25 posted on 05/14/2010 9:10:13 PM PDT by OneWingedShark (Q: Why am I here? A: To do Justly, to love mercy, and to walk humbly with my God.)
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To: HiTech RedNeck

not a clue what you are yammering about. Loss twist does not make sense. I am never a bs monger. Any time you alter the rate of twist as a function of distance down the barrel, you increase friction between bullet and barrel.

not a good thing.

however, funny things effect accuracy. things that are not very intuitive. Varying rate of twist may improve accuracy somehow for some strange reason.


26 posted on 05/14/2010 9:10:47 PM PDT by mamelukesabre (Si Vis Pacem Para Bellum (If you want peace prepare for war))
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To: mamelukesabre

The bench shooters seeking ultra accuracy would probably agree.


27 posted on 05/14/2010 9:10:48 PM PDT by Blood of Tyrants (The US will not die with a whimper. It will die with thundering applause from the left.)
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To: OneWingedShark

You are ignorant further. LOL

“Progressive” and “Progressive” rifling? Get it? LOL


28 posted on 05/14/2010 9:11:24 PM PDT by Vendome (Don't take life so seriously... You'll never live through it.)
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To: Vendome

>Inconceivable!

LOL / “I do not think that word means what you think it means.”


29 posted on 05/14/2010 9:11:31 PM PDT by OneWingedShark (Q: Why am I here? A: To do Justly, to love mercy, and to walk humbly with my God.)
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To: Travis McGee

Travis gets the cookie!


30 posted on 05/14/2010 9:12:13 PM PDT by ExpatGator (I hate Illinois Nazis!)
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To: plinyelder; OneWingedShark

Sadly his ability to process inferred humor, was severely “winged” and now he is shot.


31 posted on 05/14/2010 9:13:43 PM PDT by Vendome (Don't take life so seriously... You'll never live through it.)
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To: ExpatGator

Quick on the mouse-trigger.


32 posted on 05/14/2010 9:13:58 PM PDT by Travis McGee (---www.EnemiesForeignAndDomestic.com---)
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To: Vendome

>You are ignorant further. LOL
>
>“Progressive” and “Progressive” rifling?

Yeah.

>Get it? LOL

I got it. While I do tend to like puns/plays-on-words I despise the redefinition thereof; ‘progressive’ [& ‘liberal’, for that matter] are such redefined words.


33 posted on 05/14/2010 9:17:50 PM PDT by OneWingedShark (Q: Why am I here? A: To do Justly, to love mercy, and to walk humbly with my God.)
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To: plinyelder; Vendome

>Sadly his ability to process inferred humor, was severely “winged” and now he is shot.

Hm, try this humor piece I wrote:
http://www.freerepublic.com/focus/f-chat/2513906/posts


34 posted on 05/14/2010 9:18:40 PM PDT by OneWingedShark (Q: Why am I here? A: To do Justly, to love mercy, and to walk humbly with my God.)
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To: OneWingedShark
From about 5 minutes of quick research, gain twist rifling is, or was, used to counter the problem of soft lead bullets "stripping out" of the rifling, rather like a screw stripping it's threads.

There are a few people who still make custom black powder barrels with this feature, to gradually increase the spin rate of a soft lead bullet or ball. But, they are talking about increasing spin from 1 in 96 to 1 in 48. These are VERY slow rates, meant for the longer barrels and lower pressures of black powder.

The harder material of copper, when swaged into constant rate rifling, pretty much solves stripping as a problem.

Keep thinking, though, Butch, that's what your good at...

35 posted on 05/14/2010 9:21:50 PM PDT by jonascord (We've got the Constitution to protect us. Why should we worry?)
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To: OneWingedShark

Variable or varying? The former don’t quite seem possible.


36 posted on 05/14/2010 9:22:09 PM PDT by umgud (Obama is a failed experiment.)
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To: OneWingedShark

Still funny and your response made it funnier.... LOL


37 posted on 05/14/2010 9:25:17 PM PDT by Vendome (Don't take life so seriously... You'll never live through it.)
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To: OneWingedShark; plinyelder

I see why the play on words escaped you....You are an intellect. Very cerebral and not given to laughter.

LOL

Just kidding, good article.


38 posted on 05/14/2010 9:27:19 PM PDT by Vendome (Don't take life so seriously... You'll never live through it.)
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To: Vendome

Thank you.


39 posted on 05/14/2010 9:33:19 PM PDT by OneWingedShark (Q: Why am I here? A: To do Justly, to love mercy, and to walk humbly with my God.)
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To: OneWingedShark
My .45 cal muzzle loader has a gain twist barrel I bought from Numrich Arms in the 60s. I don't think they are made now, everything seems to be button rifled rather than cut. You can do gain twist with a button but no one seems to do it.

I made the rifle for deer and hog. I can start a pure lead round ball off with a heavy charge and the gain twist limits stripping, where the rifling fails to hold on the patch and ball. It also works OK with short conicals. The balls usually stopped under the hide on the offside, just about flattened out. I never had to do any chasing down of wounded critters, it hits hard.

As I remember my barrel starts at 1 turn in 72" and is about 1 turn in 56" at the muzzle.

Jacketed bullets might be a whole different matter, the twists involved are usually much faster.

40 posted on 05/14/2010 9:45:11 PM PDT by SWAMPSNIPER (The Second Amendment, A Matter Of Fact, Not A Matter Of Opinion)
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