Poll: What moves first, Bullet or Case?

fnuser

Pumpkinslinger wrote:

slimjim wrote:

How to keep gun nuts busy all day!

Too true!

now that IS the pot calling the kettle black.

chambered221

I think it could be either one depending on the details !!!

A benchrest setup that only neck sizes half the neck with minimum tension compared to a military round that is crimped into a cannelure ...........

English Mike

They both move at the same time, as pressure is applied equally to the case & the bullet.
Basic physics.

Bushmaster

I voted "bullet" Why?? Unless you count the firing pin pushing the case forward in the chamber the bullet has to act against the pressure before the case is shoved back against the breech face. Like some stated years ago..."For every action there is an opposit and equal reaction." But some one has to initiate the action and in this case the bullet is the culprit...

Suzanne

Here's the thing though....does equal and opposite reaction mean simultaneous action? One action causes another action of equal and opposite value. That's why he used the word reaction, which literally means a reverse movement or tendency.

edjewmukated
Suz

Bushmaster

Yup...Thats what I said...

Pumpkinslinger

^^^ What English Mike said ^^^

Suzanne

Ok I"ll answer my questions for you...... my thinking is so advanced for you...does equal and opposite reaction mean simultaneous action? No it does not. One action causes another action, which means that one action happens before the other. It's called cause and effect. Simultaneous means all at once. I believe that English M, is saying simultaneous (which is the point I'm arguing) BushM is saying the bullet leaves before the case expands (I think).

If you picture it as a pea shooter with a straw and the only restriction, being the tight fitting pea, but your straw is made from saran wrap (less dense and more flexible) wouldn't you say the saran wrap is going to expand before the pea moves?

I feel
like I'm
takin
some
bait (for what I dunno)
Suz

Bushmaster

If you think creating pressure inside the case is going to make either one move you are wrong. One of them has to start the "action" before you will have a "reaction"

The bullet just starts to move and the case is [will be] sent in the opposit direction.

If neither one moves all you have is a bulgy case. Very Happy

Suzanne

Ok I get your point, both the case and the bullet are going to move at the same time. But what you are saying is the build up of pressure is not going to force the bullet to move? I better quit putting gunpowder inside my reloads!! What does the powder charge do then?

You say one of them has to start the action. How is any action started without pressure?

Ok so then you state that the bullet just starts to move.......well what caused it to move?

I don't understand your interpretation of, neither one moving. I never implied that.

I believe the first action is that the case expands, (the only movement I'm talking about is expansion) the second action is the bullet is forced from the case, during that time the case and bullet move in opposite directions.

I'll give you a second chance....

I still
like you...
Suz

fnuser

me too suz

PaulS

The case moves forward under the fall of the firing pin.
The case then begins to expand as the powder burns.
The bullet begins to move into the barrel.
The pressure rises pushing the case backand then seals to the chamber.
During this last step the bullet accelerates down the barrel.
The peak pressure happens at about the 3" mark ahead of the chamber when all the powder is burnt and before the bullet gets close its muzzle velocity.

I know the case moves first - with or without a powder charge or bullet.

Ominivision1

You know, there are times I create controversial threads. Very Happy

slimjim

And this is relavant how?

Ominivision1

slimjim wrote:

And this is relavant how?

conservation of momentum which is Newton's 2nd law.