Primer Anvil

[Rtheurer]

The other day while I was finishing up my 1000rnds of Match ammo Nationals I got to looking at the primers in my little flipper tray. Some wont flip over and you have to flip them by hand.
I got to wondering if the seating depth of the anvil had any impact ( no pun intended) on ignition or even Extreme Spread of your ammo? Doe's it matter? What if you set those aside or grouped those together? If there is an impact, is it large enough to matter or does it get lost in the noise of powder ignition its self?

Just thinking out load as I don't know but had thought about it while flippin the little beggers.

Russ T

 

[jlow]

Does the seating depth of the anvil not normalize when you snug the primers up to the bottom of the pocket? Seems like the exposed end of the anvil will be flush up against the bottom of the pocket when the primers are seated properly?

 

[wapiti25]

yes should be flush with the cup.

 

[CatShooter]

The other day while I was finishing up my 1000rnds of Match ammo Nationals I got to looking at the primers in my little flipper tray. Some wont flip over and you have to flip them by hand.
I got to wondering if the seating depth of the anvil had any impact ( no pun intended) on ignition or even Extreme Spread of your ammo? Doe's it matter? What if you set those aside or grouped those together? If there is an impact, is it large enough to matter or does it get lost in the noise of powder ignition its self?

Just thinking out load as I don't know but had thought about it while flippin the little beggers.

Russ T

Whatever diffference there is, gets lost in the noise when the primer is fired.

 

[MagnumManiac]

Many people do not realise that primer/anvil relationship has a huge bearing on a primers function.
The primer anvil is proud when manufactured so that they are not 'loaded' against the priming pellet, this is a safety issue for transportation.
The primer cup, anvil and priming pellet all need to be 'loaded' the same once seated in a case, the cup needs to be against the bottom edges of the pocket, the anvil needs to be flush with the cup and the pellet needs to be slightly compressed by the anvil, but not crushed or deformed. All of this creates uniform primer ignition, if any of these parameters are not the same between primed cases, then ignition of the primer will not be uniform and start pressures will differ enough to give large swings in velocity and performance.
2 things effect primers badly, high seated primers and crushed primers seated too deeply, both of which give poor ignition.

Cheers.

 

[dkhunt14]

I agree with MagnumManiac. Where you see the difference is longrange and on a target. That is why the K&M primer seater has the measuring to seat all primers with the same amount of crush. Matt

 

[Larryh128]

Good info thanks.

 

[CatShooter]

Many people do not realise that primer/anvil relationship has a huge bearing on a primers function.
The primer anvil is proud when manufactured so that they are not 'loaded' against the priming pellet, this is a safety issue for transportation.

This is not true.

The priming compound is put in wet, and the anvil is placed in the cup, so the compound is cast around the anvil... then it dries.

 

[dmoran]

Many people do not realise that primer/anvil relationship has a huge bearing on a primers function.
The primer anvil is proud when manufactured so that they are not 'loaded' against the priming pellet, this is a safety issue for transportation.

This is not true.

The priming compound is put in wet, and the anvil is placed in the cup, so the compound is cast around the anvil... then it dries.

Yes it is true....
At least in all primers that I have and/or seen..... the anvil is higher/"proud", just as MagnumManiac states

 

[CatShooter]

Many people do not realise that primer/anvil relationship has a huge bearing on a primers function.
The primer anvil is proud when manufactured so that they are not 'loaded' against the priming pellet, this is a safety issue for transportation.

This is not true.

The priming compound is put in wet, and the anvil is placed in the cup, so the compound is cast around the anvil... then it dries.

Yes it is true....
At least in all primers that I have and/or seen..... the anvil is higher/"proud", just as MagnumManiac states

It is not true... Dmoran, You need to take some primers apart.


The depression from the anvil when set in the paste is clear - it could not have been "proud".

 

[dmoran]

No need to take any of the primers I have apart, you can see the anvils are higher then the felt, and are proud.
Besides, the compound is below the felt.

 

[CatShooter]

No need to take any of the primers I have apart, you can see the anvils are higher then the felt, and are proud.
Besides, the compound is below the felt.

"FELT" ?? ??? ??? ???

What the hell kinda primers are you using - there is NO FELT in a primer.

 

[dkhunt14]

I don't know what proud means but you can clearly see they are at varying heights. Primer seating can clearly effect ignition and group size at distance. If some are at crush and some are at touch and some are slightly off ignition suffers. It causes vertical at 1000 yards. Matt

 

[JRS]

ONLY Berdan primers are designed "proud". Boxer primers, are not manufactured that way. The primer contains a piece of foil Donovan ??? not felt

 

[CatShooter]

ONLY Berdan primers are designed "proud". Boxer primers, are not manufactured that way. The primer contains a piece of foil Donovan ??? not felt

I have taken most makes of primers apart, and I have never run across foil either - just compound and anvil.

 

[JRS]

ONLY Berdan primers are designed "proud". Boxer primers, are not manufactured that way. The primer contains a piece of foil Donovan ??? not felt

I have taken most makes of primers apart, and I have never run across foil either - just compound and anvil.

Bottom to top: cup, compound, foil, anvil.

 

[CatShooter]

ONLY Berdan primers are designed "proud". Boxer primers, are not manufactured that way. The primer contains a piece of foil Donovan ??? not felt

I have taken most makes of primers apart, and I have never run across foil either - just compound and anvil.

Bottom to top: cup, compound, foil, anvil.

I have only found cup, compound, anvil

Who makes a primer with foil in it - go look at your primers, and get back.

 

[JRS]

ONLY Berdan primers are designed "proud". Boxer primers, are not manufactured that way. The primer contains a piece of foil Donovan ??? not felt

I have taken most makes of primers apart, and I have never run across foil either - just compound and anvil.

Bottom to top: cup, compound, foil, anvil.

I have only found cup, compound, anvil

Who makes a primer with foil in it - go look at your primers, and get back.

Can't answer that for you. I honestly don't know, without contacting the different manufacturers. There is a small article explaining the components on the Sierra website. ExteriorBallistics.

 

[CatShooter]

ONLY Berdan primers are designed "proud". Boxer primers, are not manufactured that way. The primer contains a piece of foil Donovan ??? not felt

I have taken most makes of primers apart, and I have never run across foil either - just compound and anvil.

Bottom to top: cup, compound, foil, anvil.

I have only found cup, compound, anvil

Who makes a primer with foil in it - go look at your primers, and get back.

Can't answer that for you. I honestly don't know, without contacting the different manufacturers. There is a small article explaining the components on the Sierra website. ExteriorBallistics.

I have taken apart Remington, Winchester, CCI and Federal primers, and none of them have foil over the compound.

Sometimes, experence beats what you read somewhere. If CCI wrote it, it would have creedence, but from a company that does not make primers....

Nosler wrote in their loading manual, that loading Lake City cases was dangerous because they were so heavy that pressures were tooo high. I called them and got the "Author" on the phone.. I quoted the passageand asked him if he ever weighed Lake City compared to other commercail cases.


"Well, I ..... well actually I haven't weighed them because 'everybody' knows that they are dangerous."

So, if RCBS says it, it does not make it true.

If you make a state that someing "is", based on something you read... then you fall on their spear.

 

[dmoran]

JRS -

Regardless of the contents under, the anvil's are proud by nature of it, just as MagnumManiac and Matt stated above.

Donovan