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Joined: Jan 2005
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Campfire Kahuna
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Campfire Kahuna
Joined: Jan 2005
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Manufacturers don't make a precision guarantee Could the scarring on the bullet from the lands and grooves affect bullet flight? Of COURSE it does,....and rifling direction ( Right or left) rules that phenomena, before wind even entersin, ....which it does. Look at a Buffington Sight on a Trapdoor Springfield, and go figger. Rick's right,....there's been a LOT of knowledge lost along the way. GTC
Member, Clan of the Border Rats
-- “Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.”- Mark Twain
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Joined: Mar 2006
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Campfire Outfitter
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Campfire Outfitter
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Joined: Feb 2003
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Campfire Tracker
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Campfire Tracker
Joined: Feb 2003
Posts: 6,349 |
That corkscrew flight is a design feature. It prolongs the bullets surface to flesh contact patch and thus imparts more dynamic force. It also transfers rotational force to the viscous internal structures of the game animal, resulting in greater hydrostatic shock.
I am the NorthEast WoodsBeast!
"System version 1.3, divorced"
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Joined: Sep 2014
Posts: 624
Campfire Regular
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Campfire Regular
Joined: Sep 2014
Posts: 624 |
does a bullet rise above the line of the bore after leaving the barrel? It's a common question. The forces that act on an aircraft are gravity, drag, lift, and propulsion. Because you have lift and propulsion, an aircraft can rise. The external forces acting on the bullet after it leaves the barrel are just gravity and drag. There is no lift, and no internal source of propulsion. Per the discussion of the bullet corkscrewing through the air, I suppose that you might construct a situation where a bullet momentarily gets a few thousandths of an inch above the bore line for an instant. But in general, the answer to your question is no. Magnus effect. Side wind. Please discuss.
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Joined: Jun 2004
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Campfire Outfitter
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OP
Campfire Outfitter
Joined: Jun 2004
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Magnus effect. Side wind. Please discuss. As far as I understand the Magnus Effect, it applies to a spinning object whose axis of rotation is across its trajectory. Since the axis of a spinning bullet is along the trajectory, I don't think that Magnus Effect from forward motion of the bullet is important. You might argue that wind blowing across the trajectory satisfies the conditions for the Magnus Effect, and it does, but the effect is too small and in the wrong direction to account for vertical wind drift. Ordinary wind drift is mostly horizontal, but also has a smaller vertical component. The vertical component is from a vertical component of the drag vector, not the Magnus Effect, though you will get hot debate on that from some quarters. That takes it to the limit of my understanding. Or maybe beyond.
Last edited by denton; 04/21/17.
Be not weary in well doing.
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Joined: Apr 2010
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Campfire Outfitter
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Campfire Outfitter
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Old farts that have been shooting rifles two days before the dirt got here know this stuff!
They're called RIFLE CRANKS!!
Even birds know not to land downwind!
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Joined: Aug 2002
Posts: 2,584
Campfire Regular
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Campfire Regular
Joined: Aug 2002
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Question 3. Is this effect important to most of us? No. From page 192: So what are the practical effects of GS [gyroscope stability] on accuracy? Well it is important to realize that the bullet is traveling in a corkscrew motion about the trajectory when it is coning...For a .2 degree angle of attack the radius of the corkscrew motion will be about .009 inches for a GS of 2.98. By the time the bullet reaches 200 yards the angular motion has damped so that the radius of the corkscrew motion is only .003 inches. Bryan Litz's money (he issued a challenge for anyone to show a rifle more accurate at 200 yards than at 100) is probably safe unless someone with a lot of patience and a superbly accurate rail gun chooses to compete for it. Sounds like all the fuss is about a factor that while true in theory, is so small it gets lost in much larger errors caused by other factors. Like most of the things that provoke internet arguments. Good luck eliminating every other source of error so the 6 thousandths of an inch difference becomes apparent.
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Joined: Jul 2001
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Campfire Kahuna
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Campfire Kahuna
Joined: Jul 2001
Posts: 60,076 |
Yeah, that was my thought.
I also just reread this thread and strongly suspect some who've posted are confusing spin-drift with the "corkscrew" effect.
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John Steinbeck
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