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Old May 9, 2007, 07:05 PM   #1
oops
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Problem with Lee Sizing/Decapping Die.

I have a Lee Sizing/Decapping Die that keeps breaking the decapping pin. I tighten the collet to the point that the pin slips up when trying to decap then tighten down slightly but then the pin breaks after a short time reloading. I've broken four pins in 300 rounds.

I'm using it in a Dillon RL500B. What am I doing wrong?
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Old May 9, 2007, 07:46 PM   #2
Friiguy
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Is it crimped brass?

Berdan primed?

What size die?
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Old May 9, 2007, 08:18 PM   #3
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Old May 9, 2007, 08:19 PM   #4
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357sig. Mostly Speer and Winchester brass.
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Old May 9, 2007, 08:57 PM   #5
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Is the die set too deep? Are the cases centered in the station? 550 uses retaining pins, right? Are they the right size pins?

Just guessing--if you can't figure it out I would call Lee first thing in the AM.
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Old May 9, 2007, 10:02 PM   #6
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The sizing dye is set properly. The Lee decapping shaft and pin is held by a collet and if not tightened enough will push up and not decap. I set it just deep enough so it will decap and just tighten enough so it won't slip up in the collet but the pins snap off the shaft too often. There must be something I'm not doing right.
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Old May 9, 2007, 10:26 PM   #7
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That's weird. Is there something in the shellholder that's blocking the pin after it presses the cap out? Something must be blocking or misaligned to cause breaks like that.
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Old May 10, 2007, 01:02 PM   #8
azredhawk44
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Quote:
The sizing dye is set properly. The Lee decapping shaft and pin is held by a collet and if not tightened enough will push up and not decap. I set it just deep enough so it will decap and just tighten enough so it won't slip up in the collet but the pins snap off the shaft too often. There must be something I'm not doing right.
I was having a similar problem, but with very different equipment:
1. RCBS Rockchucker single stage press
2. RCBS .308 Dies
3. .308 brass, boxer primed

I was constantly breaking decapping pins. Turns out, the flash holes for my particular brass were extremely poorly aligned... way off center. I switched to a Lee sizing/decapping die and my problem went away.

I would immediately suspect the brass having rough or off-centered flash holes. If that isn't the case, is your decapping pin properly centered, or is it somehow bent? perhaps the collett holding the decapping pin is off centered, causing replacement decapping pins to also be off center?

Also, check to make sure that the brass is correctly seated in your loading device. Any foreign debris causing a bad alignment as the brass is decapped?

Really sounds like somehow, on some brass, you aren't getting an accurate line-up of pin to flash hole.
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Old May 11, 2007, 06:19 PM   #9
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Random thought, are you tumbling the brass with corn-cob media ??? Any foriegn object in primer hole....
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Old May 11, 2007, 09:06 PM   #10
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Almost sounds like the press is indexing while the decapper is in the flash hole.
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Old May 11, 2007, 10:35 PM   #11
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Yes I am tumbling with walnut, then corn cob but when I pull the bullet all that comes out is gunpowder.

The Dillon 550 manually indexes.

Sounds like it is the Speer brass. I will order some more decapping pins and watch the brass more closely.

Thanks everyone, for your ideas.
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Old May 13, 2007, 08:52 PM   #12
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Sounds like bad brass. I had some 9mm. The flash hole was a little small.
Pin went in, then started to get to get harder, stopped. Put ram down. Pin stayed in flash hole.
It took a while, to figure out, how to get it out. Pressed pin back in decapping pin. All good. I tossed all that stuff.
Funny a .223 pin, would fit.
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