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Primers hanging up on decapping pin

memilanuk

F'ing nuke
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Minuteman
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Mar 23, 2002
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East Wenatchee WA
Recently dusted off the 223 dies doing some loading for the mouse guns
;)


An old nuisance issue popped back up, and I figured it was time to nail it down and be done with it.

Specifically, the spent primers aren't making it all the way out.

Sometimes it works as intended, and I got the audible 'tink' of the spent primer popping out and hitting the catch.

Other times, no audible indication and when I lower the ram, the spent primer stays with the case. The way this shows up depends on the press being used. On the Co-Ax, the primer is sticking out of the case halfway, and I can pry it out with a pair of needle-nose pliers. On a press with conventional shell holders it's considerably more of a PITA. On the 550, it blocks rotation of the shell plate until it comes loose - at which point it falls into the primer slide feed cup (less than ideal).

I've tried adjusting the decapping stem out as far as I can get it - to the point of bottoming out on the case web; it made no difference.

The die is nothing special: a Redding Type S F/L bushing die. I've chucked the stem in a drill to check for runout, and I've polished the tip of the pin. Brass is Lapua match.

One theory was that maybe the tip of the pin was getting wedged in between the anvil and the cup wall; hence spinning it to check if it was bent, and polishing any burrs. Nothing.

Current work-around involves listening for the primer popping out, and if it doesn't then short-stroking the ram to air piston the primer out. It works, but it's a PITA.

I've tinkered with this off and on for a long while. I'm not sure what else to try, short of adding a separate decapping die to the process, or just getting a new sizer. Not real keen on the latter, as I've gotten *very* good results from this die - but man o man it's a pain to deal with sometimes.

Any suggestions or ideas?
 
My dies, i.e., Lyman, Hornady, Redding, and Forster, indicate the decapping pin to extend about 3/16" past the end of the die. However, if you are not bottoming out your die, e.g., bump the shoulder, then I would think the decappingpin should extend 3/16" past the top of the shellholder.
 
Short decapping pin is the only thing I can think of that isn’t a crazy idea

Unless the decapping pin is freakishly “sticking” inside the primer...so it DOES push it out of the case, but the primer stays stuck to the pin, and then when you lower the ram it starts to seat the primer again until the pin pulls free.

If the latter is the case, maybe try flatten the bottom of the decapping pin slightly? I’m not sure
 
I think I'm with Dibbs on this, likely a short pin. You could confirm by measuring pin protrusion relative to other dies.

If you're going to do it on the 550 though I'd just swap over to a Lee universal decapping die in station 1. So much cleaner to keep decapping away from the FL sizing die.
 
The primer is getting stuck on the end of the decapping pin and then pulling the primer back into the case when the ram is lowered. Cut an angle on the end of the pin, like a chisel grind.
 
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Switch it over to the large decapping pin. You're most likely using the .060 pin and pushing it through an. 080 hole. If it's not perfectly centered it'll stick in the anvil.
The large pin will stay centered in the flash hole.

Otherwise, a short pin is the problem.
 
Switch it over to the large decapping pin. You're most likely using the .060 pin and pushing it through an. 080 hole. If it's not perfectly centered it'll stick in the anvil.
The large pin will stay centered in the flash hole.

Okay, I hadn't considered that.

The 308 (in the picture above) has a small pin for Palma brass... measuring 57 thou.

The 223 & 6.5CM both have 'large' pins... at 62 thou.

...versus a Lee universal decapping die pin @ ~75 thou, or an RCBS heavy duty universal decapper @ 72 thou, or a Harvey hand depriming tool @ 66 thou.

It's not much, but it might be just enough... ?
 
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