Posted on 05/14/2010 8:23:57 PM PDT by OneWingedShark
I was wondering about gun-smithing recently. Particularly rifling; I dont know anything about the actualities of smithing, so its 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.
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.
>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.
;)
>>>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.
Inconceivable!
Nah, I wasn’t really offended; just puzzled.
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.
The bench shooters seeking ultra accuracy would probably agree.
You are ignorant further. LOL
“Progressive” and “Progressive” rifling? Get it? LOL
>Inconceivable!
LOL / “I do not think that word means what you think it means.”
Travis gets the cookie!
Sadly his ability to process inferred humor, was severely “winged” and now he is shot.
Quick on the mouse-trigger.
>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.
>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
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...
Variable or varying? The former don’t quite seem possible.
Still funny and your response made it funnier.... LOL
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.
Thank you.
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.
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