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Dillon 750 problems


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Bought a 750 and so far not impressed, oal about the same as my loadmaster and getting high primers which Dillon has no answer for, at least the loadmaster had adjustable primer depth also having occasional missed primers and the new roller for the indexer is binding ( just a brass roller , not a roller bearing) they are good about sending new parts but I am wishing I had sent this back within the 30 day return period and stuck with my loadmaster and occasionally getting crushed flipped primers for what this Dillon cost ... 

 I have tried tightening the shellplate adjusting the wire spring that holds the case in place , making sure to push all the way forward on the handle and still getting occasional primers .005 high and then take them to my rcbs single stage and reset them easily ... 

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After a good nights rest, I took another look at this high primer problem. I noticed the Dillon primer pin was a lot larger in diameter than the one on my loadmaster and the Dillon pin would only slightly enter the primer pocket of a 9 mm , while the Lee pin went in with room to spare . I took the Dillon pin to my drill press and used 220 grit paper to polish the pin until it would go into the pocket and then progressively used 400, 600 and 1500 to polish it I also slightly broke the edge from to to side. I think it was 171 thousandths when done. 
 It now will enter the case completely and smoothly. I have about 150 rounds with no high primers now . I think Dillon makes it this way to eliminate crushed primers and the liability associated with that but it did not function well for me .....

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Sounds like you had the Large primer punch installed and trying to load small primed cases .

Is your other punch the same size or larger.  I have noticed that sense Mike passed away

the quality of small parts has went down. 

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If you have been loading on a Lee loadmaster it my take a little getting used to priming on the up stroke.  I very seldom have high primers when loading my XL650 or my new XL750 when I'm standing if I set I'll have about 5% high primers.  Don't give up on your XL750 if you are one of the few that cam make a Loadmaster run you will have the Dillon machine running like a top.

Edited by lewmed
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LewMed , I have been sitting using the 750 and was getting about 5% high like you , I will try standing and see if that helps ....

Yes , the Loadmaster took years to get right and then need fixing again here and there .. hoping that the 750 will stay good after fixed , it looks to be much better built and is much smoother... waiting on a new primer slide assembly from Dillon and will try your technique of standing ... Thanks for the advice 👍

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Spokewrench,  I'm  5'7" and have found that mounting my reloading machines on a bench 40" high is right for me I can see the powder level in each case and I get very few high primers.  I almost never get a high primer when using the stock Dillon lever and round knob but the roller handle is very cool and my shoulder likes the roller.

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Well , put new slide assembly in ( noticed on new one the primer pin is black not gold) and was still getting occasional high primers , called Dillon and they were very pleasant and walked me through all the procedures and I still had same issues, so Dillon suggested to identify the headstamps that we’re giving problems and sure enough it was only the R-P headstamps but only occasionally... They measure the same as the rest of the brass except the diameter of the neck is consistently.003 to .005 smaller .. any ideas ? 

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OP flipped primers can be caused by the plastic tip on the primer feed tube, check and make sure that it is not damaged or being hit by the primer cup each time it returns. Looks like your other issues have been cured. Other than the primer issue would you say that the 750 was a good upgrade from the 650 I have been seriously thinking about doing it because I like the individual primer feed system on the 550. 

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  • 4 weeks later...
  • 5 months later...
On 3/11/2020 at 12:20 PM, Spokewrench said:

Well , put new slide assembly in ( noticed on new one the primer pin is black not gold) and was still getting occasional high primers , called Dillon and they were very pleasant and walked me through all the procedures and I still had same issues, so Dillon suggested to identify the headstamps that we’re giving problems and sure enough it was only the R-P headstamps but only occasionally... They measure the same as the rest of the brass except the diameter of the neck is consistently.003 to .005 smaller .. any ideas ? 

 

Spokewrench:

Did you ever find any solution to this?  I have the SAME EXACT issue as you.  9mm, only R-P headstamps on XL-750.  High primers, but just like .001 high, enough to cause lite strikes when used in my shield.

I already have the updated Primer slide.

I spoke with Dillon, Dillion said to adjust the timing, but the primer punch cup lines up perfectly with the shellplate, so I can't see how that is an issue

Checked the height of the primer punch / cup and as per spec it's between 1.380 - 1.390 (Did this like 5 times already)

 

Wondering if you came up with anything.

 

Thanks

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Just an option. Have used a 550 for over 30 years.  Same primer system. There are primer brass combinations that requires more effort

To seat the primers. This is the reason for the problem. Pay closer attention to how far the upstroke push goes. It really comes down to press

Operation.     Will also add most all current 9mm ammo is crimped primed. This is not the conventional crimp whe have seen in the past.

You can not see it but swagging fixes it.

Edited by AHI
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21 hours ago, AHI said:

Just an option. Have used a 550 for over 30 years.  Same primer system. There are primer brass combinations that requires more effort

To seat the primers. This is the reason for the problem. Pay closer attention to how far the upstroke push goes. It really comes down to press

Operation.     Will also add most all current 9mm ammo is crimped primed. This is not the conventional crimp she have seen in the past.

You can not see it but swageing fixes it.

AHI,

Thanks for the info, the R-P cases do feel very different when pushing the handle forward, much tighter and doesn't  seat like the other cases.

I will for sure try swageing some cases for sure and see if that makes the differenct.

Thanks

-Craig

 

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5 hours ago, CyclingCraig said:

AHI,

Thanks for the info, the R-P cases do feel very different when pushing the handle forward, much tighter and doesn't  seat like the other cases.

I will for sure try swageing some cases for sure and see if that makes the differenct.

Thanks

-Craig

 

I now load all 9MM on a 1050 because of primer issues.

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