CCI BR4 and 450 primer problems

[deadidarren]

G'day all its been a long time since I had to buy primers as I have heaps but decided to grab some 450 and br4 and was surprised at them piercing so measured the cup thickness and it came up at 0.016" instead of the supposed 0.025"

Just wondering if anyone has come across the same thing .
I figured I would post this for reference.


Cheers

 

[rijndael]

I'm not sure that measuring a curved surface with a caliper is an ideal way to do this.

I'd probably start with a ball mic, like the ones for measuring necks.

 

[chop house]

I'm not sure that measuring a curved surface with a caliper is an ideal way to do this.

I'd probably start with a ball mic, like the ones for measuring necks.

I believe the error would be to measure too thick. Not sure how much they might flow on firing. Was this on new or fired?

 

[Dgd6mm]

Is that the side of the primer?

 

[Richard Jones]

Was this with a proven load? Nothing changed but the primers? What is your load? I've shot 'a few' BR4's and 450's and have not experienced pierced primers.

 

[deadidarren]

Load is 24g of varget 75g eldm and 80g vld berger .
The primer is a new one cut in half with side cutter's and it measures the same as a decapped fired one .
And it is the wall of the primer.

 

[fkimble@charter.net]

Well that primer thickness chart is almost as old as Methuselah! Manufacturers keep cutting corners so thinner is cheaper to make, but more profit. Also it'd possible that they have gone to using 400 cups to make 450 primers? Or a factory mistake where the wrong cup was used or a batch of 400's got put in 450 boxes.

Frank

 

[rijndael]

I measured my CCI 450s, they're no where near .025", it's a lot closer to .017"

 

[K22]

Are you loading for a 223 Rem?

I don't load heavies for the 223 Rem, but Nosler shows 25.0 Varget max load for 55 grain bullets. Did you experience any hard bolt lift or ejector marks on the case head?

Just wondering if you are over the pressure limit for the cartridge.

 

[rogina]

I measured my CCI 450s, they're no where near .025", it's a lot closer to .017"

I think you would have to measure the top, not the wall.

 

[Rocketvapor]

Is the wall thinned when stamped?
What is the weight of your 450 primers?
Could a "Vendor" have swapped out 400's for 450's?
Flipping a flat at a time wouldn't take long to MAKE extra boxes of 450 primers

 

[powderbrake]

Look at the drawing of the cup.
"A" is the thickness of the bottom.
The sides are most likely thinner due to being drawn upwards.

 

[Wild Bill IV]

Look at the drawing of the cup.
"A" is the thickness of the bottom.
The sides are most likely thinner due to being drawn upwards.

The title to the chart says "A" Cup Thickness which is the cross section thickness of the base AND walls!!!

 

[6.5 forever]

The title to the chart says "A" Cup Thickness which is the cross section thickness of the base AND walls!!!

Hey Bill are you sure about the wall being the same as the base? The drawing shows that measurement "A" being taken on the base. I'm not a engineer and you may be right!

 

[Wild Bill IV]

Hey Bill are you sure about the wall being the same as the base? The drawing shows that measurement "A" being taken on the base. I'm not a engineer and you may be right!

I did mechanical drawings for over 25 years!!! The chart states the WHOLE CUP THICHNESS SPEC WHICH IS BASE AND WALLS!!! The dimension of A is in the appropriate location under dimension rules of Drafting!!! It applies to all thickness of the cup!!

 

[6.5 forever]

I did mechanical drawings for over 25 years!!! The chart states the WHOLE CUP THICHNESS SPEC WHICH IS BASE AND WALLS!!! The dimension of A is in the appropriate location under dimension rules of Drafting!!! It applies to all thickness of the cup!!

Gotcha! Thanks for the info!!

 

[rwj]

I did mechanical drawings for over 25 years!!! The chart states the WHOLE CUP THICHNESS SPEC WHICH IS BASE AND WALLS!!! The dimension of A is in the appropriate location under dimension rules of Drafting!!! It applies to all thickness of the cup!!

The manufacturing process doesn’t care about the drawing…

 

[Wild Bill IV]

The manufacturing process doesn’t care about the drawing…

Really!!! Would you buy a rifle that was out of spec? The manufacturing process is designed around the specs!!! The punch and dies are tooled for that spec!!! I know, I was a process engineer in a world wide manufacturing company!!!!!!

Edit note: The shortage of LR primers is due to world wide conflicts! Our military holds to tight tolerances!! After all, they don't want service members lives put at stake from imperfection of primers!! Especially in auto weapons!! But, you could be right! Maybe reloaders are getting the 2nd rate products!!!

 

[drop_point]

How do we know the specs? Who put out the chart and why is CCI obligated to abide by it's "specs"?

 

[Murray Brook]

I would like to measure one. Is there a safe way to remove the primer anvil and compound.