cxm Posted July 29, 2023 Share Posted July 29, 2023 I had a really frustrating time yesterday... I was trying to set up the tool head with 9x19 dies. All went fairly well until I ran some test cases through the 750. About 20% of the once fired Mag-Tech cases did not deprime correctly. The primer would be bent outward and extend more or less half out of the primer pocket... but the primer did not eject. This is extremely frustrating to say the least. I was using a RCBS size/deprime die that worked great in my old Dillon 550b. Anyway, I don't have a Dillon 9mm carbide die so I decided to use my 38Super die which is labeled as being good for both 38Super and 9mm. Previously I had called Dillon and they didn't have much help to offer other than to put to deprime pin in a drill and re-shape the pin into a truncated cone shape... which I did with no improvement. Unfortunately I got in improvement with the Dillon dies... maybe even worse. I also have a Lyman size/deprime die so I gave that a whirl too... no improvement. Of course this happens on a Friday so Dillon is closed today... I have looked on the net for help on this topic but with not much luck. There is some speculation this is caused by a vacuum created in the die sucking the spent primer back into the primer pocket. Has anyone else had this issue? And if so would you please share your solution? I have been thinking and wonder if drilling a small hole in the die body might releive the vacuum and solve the problem? Or would I just ruin the die? Any help would be appreciated. Thanks in advance Chuck Link to comment Share on other sites More sharing options...
RangerTrace Posted July 29, 2023 Share Posted July 29, 2023 I'm having this about once every 500 rounds on my 1050 with Lee decapping/sizing die. I think it's just crimped primers. I can't even feel that its happened until I smash another primer on top of the one that didn't come out. Link to comment Share on other sites More sharing options...
BoyGlock Posted July 29, 2023 Share Posted July 29, 2023 In my 550 I filed a bit of the depriming needle tip on one side only to create an eccentric force and push the spent primer a bit to the side to prevent it from sticking on the needle tip and be drawn back to the primer hole. I got this trick from this forum I think. Link to comment Share on other sites More sharing options...
ysrracer Posted July 29, 2023 Share Posted July 29, 2023 Crimped primers? Popped de priming pin? Norma cases? Link to comment Share on other sites More sharing options...
Farmer Posted July 29, 2023 Share Posted July 29, 2023 Crimped primers need more recapping pin length. The primer stretches before clearing the pocket and if you don’t have enough pin length to push it clear it just stays there. Try lengthening your decapper or maybe pre-process them on your 550. Link to comment Share on other sites More sharing options...
IVC Posted July 29, 2023 Share Posted July 29, 2023 If it's not punctured (ringer), you need a longer pin. The longer pin will either force the primer out (yay) or puncture it and cause the ringer (boo). If you now get ringers, you'll have to change the pin into something wider, which usually means you'll have to experiment with different dies. Link to comment Share on other sites More sharing options...
shred Posted July 29, 2023 Share Posted July 29, 2023 The other thing that happens is crimped-in primers fold-in on the decapping pin and get stuck to it and when you retract, they get pulled back into the pocket. Polishing the pin and having it at a slight angle (just don't make it perfect after it bends a little) helps keep that from happening. Vacuum is not it, or you'd hear a pop whenever you deprimed a round, plus even were there a perfect vacuum in the case, there'd only be about 5 oz of force pushing the primer back in. Link to comment Share on other sites More sharing options...
Nc1911 Posted July 29, 2023 Share Posted July 29, 2023 Use a Mighty Armory universal decamping die and do a 2 step process and decap separately before loading. Link to comment Share on other sites More sharing options...
Squirrel45 Posted July 29, 2023 Share Posted July 29, 2023 I also get this, most of the time it's European crimped 9s that cause issues. However I have found that other non crimped brass will also cause this. Unfortunately I don't have a Dillon decapping die. On the one year wait list. Link to comment Share on other sites More sharing options...
sharko Posted July 30, 2023 Share Posted July 30, 2023 Probably primer pullback. Several years ago I had a rash of that with Speer brass on my 650 with the old style (not spring loaded) sizing die. Dillon told me to file/grind the pin flat on the bottom and it seemed to greatly help. Since I have the newer dies and may only have that once in 10K. Link to comment Share on other sites More sharing options...
4n2t0 Posted July 30, 2023 Share Posted July 30, 2023 (edited) Crimped primers (I don't use Mag-Tech cases, so I wouldn't know) or ....... If it is primer "suck back" reshaping the extraction pin, as suggested by other members, usually does the trick. Also, if you can afford to do so, I would discard the Mag-Tech cases altogether. Edited July 30, 2023 by 4n2t0 Link to comment Share on other sites More sharing options...
m700 Posted August 1, 2023 Share Posted August 1, 2023 Like Shred mentioned I think its primer pull back. You can try replacing the pin, polishing the pin or lowering the die if possible. you may be able to find pins that are a bit longer or thinner Link to comment Share on other sites More sharing options...
DeepFried Posted August 3, 2023 Share Posted August 3, 2023 Lots of good info in here. If you do have a primer, pullback issue, this image shows how I modified a Dillon pin to prevent that. Consistently had issues with blazer primers not getting removed until making this modification. Link to comment Share on other sites More sharing options...
JonasAberg Posted August 9, 2023 Share Posted August 9, 2023 I've had the same issue with magtech brass, using a Dillon decapping die. I just got fed up with it and started sorting out the magtech cases. Link to comment Share on other sites More sharing options...
APL-G35 Posted August 9, 2023 Share Posted August 9, 2023 As above either extend the decap pin or you are getting primer pull back. I Chucked my decap pin in a drill, sanded with 1200 grit and then scotch brite to polish, after I did this no more issues. Link to comment Share on other sites More sharing options...
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