5.56 Flat Primers

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The easiest way to tell if primer is seated "below" flush is simply use a straight edge (like your caliper) and rest it on the case head. There should be clearance.

I also think the crimps have not been removed fully. I ream them out, gave up on swagging,

You don't need #41 primers, how many millions of rounds have been loaded with regular SRP primers before marketing introduced #41 primers??. What do the reloading manuals use?? Yes, SRP
 
29F65FC1-F642-4F2B-86D0-9D14032A196D.jpeg That is def a flat primer

I am currently using the swage tool and then running a Lyman Counter sink in them. They seat pretty nice as compared to my old chamfer only method, which they would hang up.

I ran the scale on the bottom of several of these and they look pretty good imo
 
Thanks again for the input folks.

I ran a new batch of 50 and put a heavier swage on them. Big difference.

Also noticed the Rem 7-1/2 feel harder when one may catch on the side of a primer pocket.

Got 50 loaded up and they look good.
 
FWIW l tried several methods to remove crimps on primer pockets and that CH4D tool was the easiest to use once set up. Do watch a couple videos though as it does not come with a manual.
 
FWIW l tried several methods to remove crimps on primer pockets and that CH4D tool was the easiest to use once set up. Do watch a couple videos though as it does not come with a manual.

...and definitely practice with a few cases you aren't afraid to lose, until you get the hang of it. I found the SP swage a lot easier and uniform compared to the LP because the large cases tilt in the shellholder.
 
I use my rcbs chamfer tool to remove crimp. It's slow but only has to be done once. Still have about 600 to do, but I have to deprime them first.
 
I tried my best to remove those crimps. The swagger die sticks, so it’s a job.

I am going to run a few trials and shoot a few of these in my other Ar.


I love to torture myself so I do them all by hand with a flash hole deburring tool. Amazing what you can accomplish with 5-gallon buckets of brass and a few movies. I managed 2 buckets in a weeks time and have never watched so much television in my life.



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I'm not really reviving an old thread, but have an added comment only fwiw... if you want to avoid (forever) the chance of primers not being seated at the correct depth, or not consistently, use something like the Lyman Ram Prime Die for primer seating. It allows you to set the depth of primers exactly, with NO variation. You simply run your press handle to the stop, and the primer is at the adjusted depth every time. No hassle. No question.

I went through a stage many years ago when seating primers with RCBS's Model 1 bench-mounted tool. After spending time talking with CCI, we determined my primers were occasionally too deep, which broke the priming mixture, causing no ignition. Consequently I had 3,000 9mm cases to de-prime. It was not an experience to repeat. The Lyman Ram Prime Die has eliminated any chance of that happening again.
 
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