Diagnostic help please. De-capping issue.

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SC_Dave

SC_Dave

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I hope I can make this understandable. Long time issue with 9mm.

1 in 10-15 cases will not decap. Meaning the primer will not push completely free of the case and drop away. So it prevents shell plate from rotating on my LnL AP because the primer is only partially out and is binding the ram plate. The Sizing/Decapping die is RCBS. I have adjusted the pin as far down as I safely can without the collar that holds the pin protruding below the bottom of the die.

The cases are not crimped and are not the same manufacturer. I have also eliminated the possibility that the pin is being pushed up by the case.

Anyone have this issue before? Thanks in advance for your help.
David
 
Sometimes, the decapping pin gets caught on the anvil of the primer and will not let go until the case is withdrawn from the die. The spent primer then gets partially stuck back in the case.

Try polishing the tip of your decapping pin to make sure there is nothing on the pin that can catch on the primer.

Also, moving the decapping pin up into the die can help. It seems counter intuitive, but the primer then tends to pop off the decapping pin before it gets stuck to the decapping pin.

I hope this helps.
 
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I had to quit using CCI primers because of the same issue. It was driving me crazy.

No matter the caliber, around 70% of the time I was having to run the case in twice before the primer would finally fall out.
 
Two considerations, one make sure your decapping pin does not have a sharp point on it, and no burrs to catch anything.

re-confirm your decapping pin height/position. Make sure it is able to push out completely.

Also on the return stroke on your press, don't be too gently, a slight jolt on the upswing may be all you need if your being too gently on the return stroke.

FWIW. Some primers fit more snug and thus require a little more to get them out.

Leftytsgc
 
I see this occasionally, and the primer is grabbing the pin just hard enough to be wedged back into the pocket mouth.

Contour the pin as blunt, break the corner a bit, and polish.
 
I have done 10s of thousands with my Lee decap die on my LNL no issues....
(mixed range brass of lots of flavors)

I agree with WalkAlongs post above.

Hope you get it worked out 1 in 10 or 15 would be a major PITA.
 
Skgreen said:
https://www.midwayusa.com/product/1011892738
Click to expand...
Those definitely will decap the brass, the issue I have with them on my 550C is they send primers everwhere. I have gone back to the standard decaping pin on my RCBS dies and am playing around with the profile to try and get them to not suck the primers back. Strangely enough the 45ACP dies I have that are Hornady, do not have the problem of getting primers stuck to them, they decap properly 99.9% of the time.
 
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The spring loaded Dillon dies are good for elimination of “pull back”. Polishing them might help but I always just put an angle on the end if I have a problem with primers sticking. Guess they can’t get pulled back into the pocket if they are not square with it, so they get knocked off.
 
The RCBS universal deprimer has a spring loaded tip. Due to size of the spring body it can not handle small calibers like 224 dia. The only bad thing about RCBS spring loaded deprimer is the spring they use, takes a set (too weak) when working with crimped primers. When the spring collapses, the pin gets out of center and gets bent. I called the CS when this first happened and they sent me a complete new assembly. Still has the weak spring. I found a old spring that came of my AR and cut it to length, now it will launch one with authority. No more sticking. Haven't had the problem since.
 
***UPDATE***

As suggested, I removed the pin, eased the edges and polished it. Re-adjusted the depth so that it's just enough to pop the primer out. I only had time to run 50 rounds this morning but I had no issues with those 50. I'm going to say problem solved until it shows me otherwise. Thanks all for your help. @Dudedog is right, it was a PITA.
David
 
I have tried three ways to decap 9mm on the Mk7, MA (Mighty Armory) decapper with and without the spring upgrade, and using a Lee Universal Decapping die. I can't get anything to work consistently so far. I never had any problems decapping on my RCBS turret press with the 4 die Lee sets for 70,000 rounds.

On the Mk7, I started with the MA decapper, which came with the press, then tried the Lee Universal, but got spent primers sucked back into the primer pocket. At the next station the swaging die wreaked havoc. Then I purchased the spring upgrade to the MA decapper. This was 100% successful in decapping, but the shock load from the spring sometimes flipped a new primer sideways just before being seated. I'm told that using the MA spring has had the same result in other Mk7s.

Yesterday I tried two of the suggestions on this thread, lightly smoothing the tip of the pins with 1000 grit sandpaper, and unscrewing the die to move it higher. I didn't see how to move the pin higher into the die. I decapped about 100 cases and removed them before swaging for inspection, and I continued to get decapping failures, using both the DA and Lee dies. It seemed that the problems occurred when it was very easy to decap. Maybe an slightly oversized primer pocket was involved, but I didn't find any using the primer pocket gauge.

My next plan is to re-install the spring upgrade to the MA decapper, but not install it according to the directions. The MA pin extends down much farther than the Lee pin from the base of the die. Maybe delaying the decapping a little will help prevent sideways primers. Also, I have tightened down the shellplate and the slight wobble that was present was eliminated, which might help too.
 
I’ve yet to find a solution to this same problem and I’ve tried all the fixes mentioned. It really irritates me.

Having said that, I have a Redding universal decapping die that does it the least so I decap everything as an additional step
 
I use the RCBS spring loaded primer punch in my LNL-AP and deprime as a separate step for 9mms prior to their Ultrasonic bath. It shoots them out of there and down the tube.
I tried to polish my pins also but never fully got rid on the problem with CCI primers either so I quit using them for .357mag . I deprime them on my Rockchucker since my LNL-AP is always set up for 9mm.

I can't use the spring loaded punch pin on the Rockchucker because it sends them into low earth orbit. I don't like wearing a face shield to deprime cases or cleaning up the mess afterwards.
I ran out of CCIs finally and started using the Remington 5 1/2's I had and after rounding off the punch pins, they behave themselves when depriming in my Rockchucker with my '06 depriming die.
They don't fall apart during the process like CCIs seem to do.
 
They don't fall apart during the process like CCIs seem to do.
Click to expand...

I am using 9mm range brass so some of it is mine (S+B primers) and the rest is who knows.
Interesting that CCIs seem to be a problem. Has any one else tied the problem to CCI primers?
Since I can't get S+B primers anymore I started buying CCIs, may need to rethink that....
 
One thing that can hang up a primer is just a little corrosion. I had a problem with primers sticking in some range brass. They would not let go. One actually stretched out below the case head, like a bubble. The brass was dry when I picked it up, but had apparently laid on the ground long enough to get damp (overnight). The primer corroded to the pocket on several of the cases. There was evidence of corrosion on all of the punched primers. Just thought I'd mention...
 
Nature Boy said:
Having said that, I have a Redding universal decapping die that does it the least so I decap everything as an additional step
Click to expand...

I had to sharpen the decapping pin from a semi-sphere to a truncated cone on my RCBS universal depriming die.
I smoothed it some first, then, impatiently, went overboard the second time with it in a drill.
It worked perfectly there after. :)
Even corroded cases that were in the bed of my truck for weeks.

I love my Lee APP dedicated decapping machine!:thumbup:
Hundreds of .223 an hour just dropping them in the shortened tube by hand.
 
Demi-human said:
I had to sharpen the decapping pin from a semi-sphere to a truncated cone on my RCBS universal depriming die.
I smoothed it some first, then, impatiently, went overboard the second time with it in a drill.
It worked perfectly there after. :)
Even corroded cases that were in the bed of my truck for weeks.

I love my Lee APP dedicated decapping machine!:thumbup:
Hundreds of .223 an hour just dropping them in the shortened tube by hand.
Click to expand...
Do you use a funnel on top of the tube? It was a tip I saw on a YouTube APP video. Just get the bottom of the case into the mouth of the funnel and gravity and the funnel take care of getting it into the tube.
 
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