Bullet Kipping Past Rifling?

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Bullet Kipping Past Rifling?

Post by beeser on Sat Dec 13, 2014 4:57 pm

When a bullet is fired through a rifled barrel is all of it captured by the rifling like a bolt through a nut or does the bullet skip past part of it?

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Re: Bullet Kipping Past Rifling?

Post by dronning on Sat Dec 13, 2014 5:19 pm

If everything is right it should start turning as it contacts the rifling, but there is always a lag (physics) albeit ever so slight.

Possible problems that could change this:
Bullet diameter incorrect too big or too small
Leading edge of rifling too abrupt / bad chamber
Poorly done rifling
Over pressure - round too hot
...... I'm sure there are others

- Dave

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Re: Bullet Kipping Past Rifling?

Post by 243winxb on Sat Dec 13, 2014 10:54 pm

A soft alloy lead bullet may skid.

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Re: Bullet Kipping Past Rifling?

Post by jell-dog on Sun Dec 14, 2014 2:07 am

Are you asking about shooting LEAD bullets?

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Re: Bullet Kipping Past Rifling?

Post by beeser on Sun Dec 14, 2014 9:22 am

jell-dog wrote:Are you asking about shooting LEAD bullets?
No, the question goes to any bullet.  It's just to satisfy general curiosity.

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Re: Bullet Kipping Past Rifling?

Post by james r chapman on Sun Dec 14, 2014 2:49 pm

Bullet dia, velocity, weight and groove depth all contribute to stability.

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Re: Bullet Kipping Past Rifling?

Post by guncheese on Sun Dec 14, 2014 5:52 pm

beeser wrote:No, the question goes to any bullet.  It's just to satisfy general curiosity.

yes bolt threading thru nut
but really really fast !!!!!

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Re: Bullet Kipping Past Rifling?

Post by guncheese on Sun Dec 14, 2014 5:54 pm

maybe a better analogy would be
a bar of material being fun thru a threading/forming die  really really really fast

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Re: Bullet Kipping Past Rifling?

Post by james r chapman on Sun Dec 14, 2014 5:57 pm

Actually, compared to a nut and bolt it is very very sloooow.
1 turn in 12 inches vs. say 1 turn in . 040 of an inch

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Re: Bullet Kipping Past Rifling?

Post by Jack H on Sun Dec 14, 2014 6:00 pm

A rotationally stable bullet will have a resistance to forced rotation.  Many factors involved in the details.

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Re: Bullet Kipping Past Rifling?

Post by guncheese on Sun Dec 14, 2014 6:00 pm

james r chapman wrote:Actually, compared to a nut and bolt it is very very sloooow.
1 turn in 12 inches vs.  say 1 turn in . 040 of an inch



well slow pitch but high speed affraid

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Re: Bullet Kipping Past Rifling?

Post by james r chapman on Sun Dec 14, 2014 6:01 pm

Well yeah lol

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Re: Bullet Kipping Past Rifling?

Post by beeser on Sun Dec 14, 2014 6:55 pm

So, the bullet rotation is 60,000 rpms as it leaves the barrel based on a muzzle velocity of 1000 ft/sec and a 1:12 twist?

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Re: Bullet Kipping Past Rifling?

Post by james r chapman on Sun Dec 14, 2014 7:05 pm

I get 5000 rpm? or is my calculator off...

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Re: Bullet Kipping Past Rifling?

Post by guncheese on Sun Dec 14, 2014 7:07 pm

MV X 720/Twist Rate = RPM

1000x60=60,000 rpm

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Re: Bullet Kipping Past Rifling?

Post by beeser on Sun Dec 14, 2014 7:14 pm

So, at 60,000 rev/min it seems to me that rotational stability is important?

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Re: Bullet Kipping Past Rifling?

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