Anyone have any data on the amount of pressure needed to expel a spent crimped primer from a primer pocket?

No idea of the pressure needed.

But, I have removed these without too much hassle with a tool I made myself.

It is a rod which I use with a hammer.

quote:

Originally posted by Saeed:
No idea of the pressure needed.

But, I have removed these without too much hassle with a tool I made myself.

It is a rod which I use with a hammer.

This ^^^^.

But I also have drove the punch clear through the primer.

Those case's go into the scrap bucket.

I have used the hydraulic method on crimped Berdan primed 6.5x55 cases. It works the same way as using grease behind a bearing and tapping a brass rod to force the bearing out, but I used a flat ended piece I turned up to fit the neck snuggly…

Cheers.

I've deprived thousands of them; never had a problem. Cal 30, 7.62, and 5.56. It takes 4.2 pounds more than a regular primer. No need to use the hydraulic method on a boxer primed case.
Of course you have to remove the crimp, or swage it out, before re priming.

No idea of pressure figures, esp. with crimped ones, but a buddy punches out all primers as Saeed does, to estimate if pressures have been too high or the cases are worn. I've tried that and just count my light taps - any that drop out too soon become suspect.

I might have to do that with a recent batch of Winchester .45-70 brass, too - some primers fell out by themselves before the first firing. Wonder if I could do my own crimping

Can you post pics of the punch tool? I've seen a couple in the past. Do you start in at the primer dimple or from the edge of the primer towards the center?

quote:

Originally posted by Saeed:
No idea of the pressure needed.

But, I have removed these without too much hassle with a tool I made myself.

It is a rod which I use with a hammer.

I would get bigger primers. Or swage the pockets smaller with a mandrel and punch machined to go into the pocket and form the outside, in a bit. We used to do that with Berdan conversions.

I just use one of these.

https://leeprecision.com/decapper-base-30-caliber

I'm dealing with Berdan primers in miliary brass. I've got 10,000 primers and need to use them and have done hydraulic, and a version of a punch to pry them out. My thought was to create a pneumatic tool similar to a pellet rifle mechanism. I figured if it was powerful enough to propel a .22 cal pellet down a barrel at 900+ fps it would blow out a primer.

quote:

Originally posted by Wstrnhuntr:
I just use one of these.

https://leeprecision.com/decapper-base-30-caliber

That's what I've got, too. It came with a 375 Win Mequon loader, apparently made by Lee.

After several posts by others re removing boxer primers, Bobster now tells us he is dealing with crimped Berdan primers which are a different kettle of fish altogether.

I remove Berdan primers from my Kynoch 404 cases (both factory shellac sealed primers and reloaded primers) using a tough spring steel pin I made of a diameter to enter one of the flash holes. I made the other end of the pin the diameter to fit an ordinary decapper rod. Have to feel for the flash hole then once 'started' drive the primer out using a small tack hammer while holding the case in the case holder with press ram raised up.
No mess and relatively quick to deprime Berdan primers with no damage to the anvil as can happen if using a pick system such as sold by RCBS for Berdan primers.

I can't say how well this would work with crimped primers, I may have some Berdan primed military brass I could try my decapper on.

I ended up making a punch based on some pics I found on the net. Used an old slot head screwdriver. Ground a tip shaped kinda shaped like a Bowie knife blade with a chisel point. Fashioned a shell holder from a flat washer to slip in the extractor grooves. Using my cast iron Lyman C-press, I inserted a Lee seating die upside down. That served as the "anvil". I then placed the shell holder on the spent brass and lowered it into the die. Placing the tip of the punch in the primer indent at a 45 degree angle, I gave it 3-4 taps with a light hammer to drive it through until it contacted the inside wall of the primer. This is the part you have to develop feel for. Then I levered the spent primer out. Once I got the hang of it, I was able to de-prime 500 cases in 4 hrs. Only lost 3 cases due to anvil damage. It easily removed even the most heavily crimped primers. Now I have a "home" for those 5,000 Berdan primers I bought 20 years ago!