Odd decapping issue

[ny32182]

Trying to figure out what is going on here...

Very recently I've had about 1% or more of 9mm cases in my Dillon 650 that make it to station #2 with the spent primer still in place. They are boxer primed, pin is not broken, etc.

Anyone ever seen this before? Nothing feels "wrong" with the stroke; I have no clue it has occured until I try to seat the new primer.

Can the pin be bent but not broken?

 

[joustin]

Check for a burr on the pin that may be pulling the primer back in.

Sent from my DROID RAZR using Tapatalk 2

 

[Miles Prower]

I've had the same issue with my 550. I bought a new set of RCBS dies to begin reloading 9mm and started having this issue. I've done lots of .38/.357 which are also small primer rounds and haven't had this happen with those.

To eliminate this issue, I ordered a set of the Dillon 9mm dies that use a spring loaded decapping pin that snaps the primer off the end of the pin. They haven't arrived yet, but they should do the trick. I use the Dillon dies on .45ACP and the spring loaded decapping pin works great.

I dumped the spent primers out on the bench and tried picking them up with the RCBS decapping pin and was able to pick up a few of them, so I'm pretty sure that's what's happening.

 

[ny32182]

This is the same pin I've been using for probably 35k+ rounds of 9mm and this just started happening in the last 500 or so, if that matters.

 

[ny32182]

Sizing die is a Dillon.

 

[David E]

Replace pin, screw die in another 1/2 turn or so.

 

[ny32182]

Also, all but one time it has occured, the old primer LOOKED perfectly flush and not moved to me, however, I bet if it were out a little bit I could have pressed it back in with the bottom of the new primer on the priming stroke?

I did find one that had the primer part of the way out.

 

[MtnCreek]

Same thing is happening w/ mine, 650 & Dillon dies. Every one has been Rem brass. Out of ~ 1,200 rds loaded the last couple months, I've had ~15 do this.

Looking forward to hearing a solution.

 

[ny32182]

Replace pin, screw die in another 1/2 turn or so.

Tip deformed after X amount of rounds? I will check and see if I have another Dillon pin.

 

[MtnCreek]

Also, all but one time it has occured, the old primer LOOKED perfectly flush and not moved to me, however, I bet if it were out a little bit I could have pressed it back in with the bottom of the new primer on the priming stroke?

I don't realize there's a problem until seating the new primer. I've taken the same brass and fed it back through the size/de-cap and it still does not de-cap.

 

[ny32182]

That is odd, I've fed the cases back through and no problem the second time.

 

[KansasSasquatch]

I've never handled Dillon dies, is it possible with the decapping pin being spring loaded that it could potentially bottom out on the case in a piece of brass with an off-center flash hole? Or could the spring possibly be worn out or be defective to the point that anytime there's a tight primer pocket it doesn't have enough force to drive out the spent primer? I'd contact Dillon and see what they say....take advantage of their warranty.

 

[ny32182]

That was my first theory... maybe the pin is bent, and any time there is a tolerance stacking with a slightly off center flash hole the pin just bottoms out (it is spring loaded). I've never noticed the rod the pin is mounted on getting popped up higher than usual though, but I'd have to be looking right at it when it happens to see.

 

[jstein650]

I got my Dillon SDB nearly 20 yrs ago, this was an issue that Dillon addressed. The original decap pin was rounded, but still too square. It would push the primer out, but the anvil on some primers would 'grab' the pin in the process, allowing it to be pulled back up into a less than tight pocket. They sent me a new set of pins back then and I've been good since. BTW - that little hiccup in the progressive sequence, for a relative newbie at the time led to a double charge - with Bullseye of all things - in a .38 It took me a while to retrace my steps to figure out how that could have happened.
Much more vigilant now.

 

[ny32182]

Sounds like maybe my pin has squared off after north of 35k... learn something new every day. I will replace the pin and see if that does it.