Firing pin force
- Thread starter sdean
- Start date
antelopedundee
internet bum
It would seem that the maximum distance would be equal to the amount of protrusion of the firing pin from the bolt face.
And only with a jammed bullet. I remember that much and dead primers.
antelopedundee
internet bum
You'd want a .308 case in a .30-06 chamber with a long flat nose jammed bullet. You might need to turn one on a lathe. Instead of a primer use a piece of steel of the same size. Remove the extractor from the bolt so that when you open it, it doesn't try to extract the round. Chamber the round and open the bolt. GENTLY tap it out with a rod and measure the length. Lay the figure down on a pad. Next rechamber it and pull the trigger. GENTLY tap it out again and measure it. Set the figure down on a pad. Subtract the figure and see if there is a difference. I'd put a smidgen of sizing wax in the case neck too if twas me.
May the force be with you!
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Centerfire
Member
Questions
1. what is the action being used
2. what is the firing spring pounds of weight
3. what caliber
4. is the case sized to only allow 0.0005" of case movement (growth)
5. what are you trying to accomplish
6. what brand of primer/size being used
7. At what depth is the primer being seated into the primer pocket.
Did I forget anything?
Centerfire
1. what is the action being used
2. what is the firing spring pounds of weight
3. what caliber
4. is the case sized to only allow 0.0005" of case movement (growth)
5. what are you trying to accomplish
6. what brand of primer/size being used
7. At what depth is the primer being seated into the primer pocket.
Did I forget anything?
Centerfire
antelopedundee
internet bum
This and nope.
FWIW, I usually replace the 24# firing pin spring in the Rem 700 with a 32# Wolff spring.
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Firing pin energy is used.
Primers are designed to NOT ignite at a stated energy, and 'must fire' at another (larger) energy.
A dropped weight is used to create the energy.
antelopedundee
internet bum
He's not asking about igniting primers. He is asking about a firing pin having enough forward force to cause a seated bullet to become seated even deeper. If you have a 24# spring and it takes more than 24# of force to make the bullet move, the spring will just stay compressed. Obviously you would not be using live primers for this.
And the primer is going to swamp the firing pin protrusion in moving the bullet down the bore.
It is a truly meaninglessness question.
And "Firing pin force" is not the same as firing pin protrusion.
The whole thing is poorly formed.
antelopedundee
internet bum
True because we don't really know what he is asking and whether we are talking about live primers or whatever. It's commonly known that firing a round with no powder in it usually has sufficient force to drive a bullet into the lands and it may stay there when you open the bolt. Of course that's primer force and not firing pin force.
However he did ask about firing pin force so that's what I addressed. That will be about equal to the weight in pounds of the spring in the bolt which is 24# in factory Rem 700s. If you replace the primer with a SOLID pellet of equal size and thickness and cock the bolt and fire, the firing pin should exert a force on the case to move it forward [assuming it's allowed to do so] at which point the bullet may seat tighter into the lands or seat deeper into the case neck. Once fired, the firing pins protrudes only so far from the bolt face and after which time it no longer exerts any force. Thus, the maximum amount that a bullet could be seated deeper would be equal to or [likely less] than the amount of protrusion of the firing pin from the bolt face.
I do note that the OP has not come back to clarify just what it was that he wanted to know.
I tried to answer the question from the confusing point that it was written.
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JerrySharrett
Senile Member
On a bottlenecked case that has the proper headspace for the chamber it is in, the case can not
shove on the bullet....
.
antelopedundee
internet bum
antelopedundee
internet bum
True; which is why I later suggested a test using a case with the shoulder set back or save the trouble and just use a .308 case in a .30-06 chamber.
The whole premise is more trouble than it's worth. As long as the primer is soft enough to accept an indentation, the bullet won't seat deeper anyway.
Of course if it COULD do it then that would be the correct maximum distance.
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antelopedundee
internet bum
No question is totally useless; it can always be used as a horrible example.
Cluelessness
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