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any idea what caused it?





can you post pics of the damage? What actually breaks when the primers go off?

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If a primer catches in the wheel and you force it you can set off the primer which sets off all of them.  The detonation isn't very loud (sounds like a bit longer bang from a single primer).  Though it may startle you, there isn't any danger of injury that I can see.

The 650's primer assy includes a Magazine Shield made of steel (the black outside tube on the assy that the primers are in), an inner Primer Magazine (small or large), made of aluminum, which you insert and load the primers in, and a Follower Rod which is inserted into the Primer Magazine after all of the primers are loaded.  A the bottom of the housing, there is a Rotary Primer Disk (small or large) held in place by a Primer Support Shim which is screwed into the housing, an indexing assy to rotate the disk and feed the primers to the Primer Seater Assy (small or large), and an adjustable Primer Station Locator Tab.

When there is a detonation, the design allows for a safe release of the energy by 1) launching the plastic Primer Follower Rod upwards, and 2) the inner, aluminum magazine splits open vertically along one side to vent the press while the steel Magazine Shield holds the Magazine inside it preventing any shrapnel from damaging the press or the operator.  The base of the shell case may or may not be damaged, however, it is held in place by the Shellplate so there isn't a concern of it becoming a piece of shrapnel either.

During a detonation, the Primer Magazine and Follower Rod are destroyed (by design) and the remaining parts of the Primer Assy are undamaged with the exception of the Primer Support Shim which is bent downwards.  Dillon will offer to replace the entire Primer Assy and I'd suggest that course of action to anyone who isn't comfortable fixing their Primer Assy or who has any concern with the integrity of the undamaged items.

If you elect to repair your Primer Assy, to return your Primer Assy to working order you need to replace the aluminum Primer Magazine, the plastic Follower Rod, and the metal Primer Support Shim (however, it may be able to be straightened and used again).  In addition, special attention should be made when inspecting the base of the housing and the Rotary Primer Disc for any damage.















And yes, I know this to be true from 1st hand experience with my press.  When it was brand new, I was still use to the tricks I used on my 550B and so I forced the disk to index over with a jammed primer in it.  It was quite a surprise but other than that, not very difficult to repair.  The most interesting thing about it was that my Follower Rod bounced off of the ceiling and broke the head off but managed to come straight down and slide back into the Primer Magazine!!!  Talk about one in a million!!

I opted to have Dillon send me a few repair parts after carefully inspecting my Primer Assy.  In truth, I was so embarrassed for doing such a dumb thing, I almost begged them to let me pay for the parts.  They gently but firmly refused and sent them out ASAP.
   

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After something like this happens, the first tihng I do is grab my balls.

Not so much to make sure they're still there, but mostly cause I just like to grab my balls.

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yeah.......pics please

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Glad to hear you're ok!  I'm sure the blue kool-aid guys will get defensive... but that sounds like a bit of a design flaw to me.  If a primer goes off when being seated in a case on my Hornady LNL, the extent of the damage would likely just be my ears ringing.

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Glad to hear you're ok!  I'm sure the blue kool-aid guys will get defensive... but that sounds like a bit of a design flaw to me.  If a primer goes off when being seated in a case on my Hornady LNL, the extent of the damage would likely just be my ears ringing.

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Glad to hear you're ok!  I'm sure the blue kool-aid guys will get defensive... but that sounds like a bit of a design flaw to me.  If a primer goes off when being seated in a case on my Hornady LNL, the extent of the damage would likely just be my ears ringing.

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It's not a "design flaw."  It's a case of a very small component interacting with moving parts that MUST have clearance and the tolerance on those clearances eventually "stacking" enough to let a primer get jammed.  Note that these "kabooms" happen in a location other than where they could impact the loaded primer magazine.  The same sort of thing can happen with a Hornady Lock-n-Load press, even though Hornady uses a different sort of mechanism...and they are no more destructive than they are for exactly the same reason: the designers took into account how primers might get loose or jammed, and made sure that primers in motion were away from the magazine tube.

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Do you actually have a LNL AP? I think not. Read my post above. It is almost impossible for it to happen on a LNL AP. You would literally have to quickly crush a primer with the seater assembly and that would most likely not set of the rest of the primers.

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I have one with an 11000 range serial number.  I've had ONE primer jam that wasn't obvious when I was first starting with it, and a few since that I caught immediately.  I can see some spilled powder and a slightly loose primer system base (just changed from small to large, for example) causing plenty of chaos.  I did not say that you could cause a huge problem, but it IS potentially possible to squash a primer that isn't lined up properly with the case.

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There is no way to crush a primer enough under the tube to detonate it. The only way is at the seating station and the slide and the tube base are a close enough fit that it is unlikely any flame would go between the two. If you get a jam under the tube the only pressure is from the slide spring. It is not a stiff enough spring to effect anything. You can't even force it because it just stays there. I have even fed small primers through the large tube and had no problems due to being in a hurry and not paying attention.

It can only jam with little pressure because the spring is not strong enough. Look at how the system works and think about it. Induce a jam and look at it closely. Especially how the slide rides the rod. Nearly impossible.

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I never said you could crush a primer under the tube.  Quite the opposite.  I said that both Dillon and Hornady designed their presses to prevent that.  It IS possible, however, to crush ONE primer at the priming station of a LNL, and it's possible to crush it hard enough to set it off.  In which case you change your pants, sweep up, and clean the press before resuming your loading activities.

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Yes and I too said the only place is the priming station. 223fmjblack stated he thought it was a design flaw. I tend to agree with him on that. Download the 650 manual and look at picture # 7 page # 4. It shows the primer magazine disk. Then I think you will see what he was saying and why I said that it would nearly be impossible in a LNL for the same thing to happen.

Dillon manuals

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There is two ways you can have this problem on a Dillon 650.  First is grime/dirt/grunge.   There is close tolerance in the slot where the primer system stages the primers.   I think Dillon said it was between .001" - .002".  Alot of dirt can eat jam a primer in the slot and can go Kaboom.  The second is "Out of Tolerance Primers"   I had a brick of CCI SR primers that a little over 200 of them were out of tolerance by as much as .004".  So with a max clearance of .002" trying to stuff .004" in there and you can get a Kaboom.  Now I sent a bunch of time complaining to CCI.  They were just about ready to replace the bad ones when I told them I was using a Dillon 650 and they never returned any subsequent calls.

So 650 users keep the primer slot area's CLEAN and try to feel the movement of the primer's in the slot.  you can tell when one is jamming up.

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There is two ways you can have this problem on a Dillon 650.  First is grime/dirt/grunge.   There is close tolerance in the slot where the primer system stages the primers.   I think Dillon said it was between .001" - .002".  Alot of dirt can eat jam a primer in the slot and can go Kaboom.  The second is "Out of Tolerance Primers"   I had a brick of CCI SR primers that a little over 200 of them were out of tolerance by as much as .004".  So with a max clearance of .002" trying to stuff .004" in there and you can get a Kaboom.  Now I sent a bunch of time complaining to CCI.  They were just about ready to replace the bad ones when I told them I was using a Dillon 650 and they never returned any subsequent calls.

So 650 users keep the primer slot area's CLEAN and try to feel the movement of the primer's in the slot.  you can tell when one is jamming up.

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This is why i prefer to hand prime, although i have a bud giving me his 650 for free, i just have to load his components/ammo which he buys.  Is priming with the 650 so much faster?  I can load about 400 rounds a hour while watching TV on the lee hand primer.

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In a word, yes.  800 pistol rounds per hour is simple with a 650 and casefeeder.  And, I wouldn't ever consider something as dangerous as reloading while watching tv.  

You're a double charge and exploded weapon just waiting to happen.  Be sure and tell me when you'll be on the range so that I can stay away, far, far away.
 

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This is why i prefer to hand prime, although i have a bud giving me his
650 for free, i just have to load his components/ammo which he buys. Is
priming with the 650 so much faster? I can prime about 400 rounds a
hour while watching TV on the lee hand primer.

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Yes, it's infinitely faster because you are performing a completely separate step by hand priming while the priming is done automatically as a result of operating the press in the 650.  I can easily completely process and load 800 rds of pistol ammo per hour on my 650 with casefeeder.  

That is starting with a clean piece of brass, decapping and resizing it, inserting a primer, belling the case mouth and metering out the correct powder charge, setting the bullet to the proper depth, and finely factory crimping the case mouth.

Do you know how many times I have to grab as case in the above stated process?  Never!  I just toss them into the hopper and crank the handle with my right hand while I set bullets on the cases with my left hand.  Couldn't be simpler.
 

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Yes, it's infinitely faster because you are performing a completely separate step by hand priming while the priming is done automatically as a result of operating the press in the 650.  I can easily completely process and load 800 rds of pistol ammo per hour on my 650 with casefeeder.  

That is starting with a clean piece of brass, decapping and resizing it, inserting a primer, belling the case mouth and metering out the correct powder charge, setting the bullet to the proper depth, and finely factory crimping the case mouth.

Do you know how many times I have to grab as case in the above stated process?  Never!  I just toss them into the hopper and crank the handle with my right hand while I set bullets on the cases with my left hand.  Couldn't be simpler.