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lyman accu-prime auto-load not able to seat primers below flush

usagi

Hi all,

I recently got a lyman accu-prime auto-load, and I can't get it to seat primers below flush.

I have a sinclair hand primer and it easily seats primers below flush.

I adjusted the primer punches so they protrude several thousand when the sleeve is compressed, per the user manual. I've tried several different brands of shellholders. I suspect the primer punch isn't centered and is bottoming out on the case head, but I can't figure out any way to verify this.

Anyone else have an accu-prime auto-load and if so, are you seeing the same issue or not?
 
Last edited:
Not the answer you are looking for, so I apologize in advance.

I have literally primed over 25,000 rifle and pistol cartridges with the Sinclair Priming Tool and never and I mean never had a problem seating a primer. This was after I had gone through several priming tools and a host of problems seating primers.

So about 25 years ago I took the plunge spending the money on the Sinclair Tool and it has never failed me. These tools are indestructible and totally reliable. Purchasing the extra heads make switching cartridges very easy. I have two Sinclair priming tools, one for small primers and another for large primers.

If it was me, I would just stick with the Sinclair tool especially if you are a precision shooter.
 
Lyman has had issues with that on their handprimer tool, may want to call them about it. There was a batch of them that got out with something not right. Seems to me they were replacing them.
 
Check the diameter of the seating plug you are using. If the plug does not go into the primer pocket, the plug will stop on the case head and will only seat to flush.
Don't ask how I know. I use an RCBS bench tool and used a large rifle seating plug for small rifle primers and that is what I got...flush fitting primers. Took a little bit of head scratching
 
KMart said:
Check the diameter of the seating plug you are using. If the plug does not go into the primer pocket, the plug will stop on the case head and will only seat to flush.
Don't ask how I know. I use an RCBS bench tool and used a large rifle seating plug for small rifle primers and that is what I got...flush fitting primers. Took a little bit of head scratching
Click to expand...

measured plug with calipers. 0.1700"

plug does fit in the primer pocket if i fit it manually.
 
usagi said:
Hi all,

I recently got a lyman accu-prime auto-load, and I can't get it to seat primers below flush.

I have a sinclair hand primer and it easily seats primers below flush.

I adjusted the primer punches so they protrude several thousand when the sleeve is compressed, per the user manual. I've tried several different brands of shellholders. I suspect the primer punch isn't centered and is bottoming out on the case head, but I can't figure out any way to verify this.

Anyone else have an accu-prime auto-load and if so, are you seeing the same issue or not?
Click to expand...
Just received my accu prime two days ago and have exactly the same problem, won't seat primers below flush. Adjusted the primer punches alot, and pulled the handle so hard I was afraid it would break. Tried different shell holders, Hornady, Alpha. Lapua brass, won't seat below flush. Had to use my old reliable hand primer to seat below flush.
 
KMart said:
Check the diameter of the seating plug you are using. If the plug does not go into the primer pocket, the plug will stop on the case head and will only seat to flush.
Don't ask how I know. I use an RCBS bench tool and used a large rifle seating plug for small rifle primers and that is what I got...flush fitting primers. Took a little bit of head scratching
Click to expand...
I did that too with my APS bench mount.
 
Have you tried with Lyman shellholders? Noticed with Lyman handprimer that only with lyman holders primer will seat properly. Had problems with rcbs, lee and redding but lyman worked just fine.
 
usagi said:
Hi all,

I recently got a lyman accu-prime auto-load, and I can't get it to seat primers below flush.

I have a sinclair hand primer and it easily seats primers below flush.

I adjusted the primer punches so they protrude several thousand when the sleeve is compressed, per the user manual. I've tried several different brands of shellholders. I suspect the primer punch isn't centered and is bottoming out on the case head, but I can't figure out any way to verify this.

Anyone else have an accu-prime auto-load and if so, are you seeing the same issue or not?
Click to expand...
Had the same problem, I made a new primer stem that was about .008 longer,might be able to epoxy a thin strip on bottom of priming stem
 
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