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Lee Collet Die Issue #15670890 01/17/21
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southtexas Offline OP
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Just loaded some rounds. Adjusted the die as recommended. Upon seating the bullets, about 60% of the bullets were tight in the neck, the remaining bullets, while not entirely loose, could be moved sightly with finger pressure. My assumption is that the necks of the brass were not of uniform thickness. Is this a correct hypothesis? Probably would not be an issue if these cartridges were just going to the range, But using them in hunting conditions causes me pause.

Would appreciate the benefit of your experiences, thoughts, and suggestions. (If it matters: 257 Roberts, 100gr Hornady ILs, R-P brass.)

BP-B2

Re: Lee Collet Die Issue [Re: southtexas] #15670985 01/17/21
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375Taylor Offline
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Not a gun writer. I would guess the problem has to do with brass springing. Try annealing your brass or getting an undersized mandrel.

Re: Lee Collet Die Issue [Re: southtexas] #15671268 01/17/21
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Do a search on here of how to set up these dies by member Mathman
The factory instructions do not work as well
If that doesn’t work take the mandrel out and spin it in a drill and take a bit off the thickness with some 360 grit sand paper, or order an undersized mandrel from Lee

Re: Lee Collet Die Issue [Re: southtexas] #15671300 01/17/21
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Simple solution... just tighten the die just a hair by turning it say a 1/8 to a 1/4 turn...clock wise...



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Re: Lee Collet Die Issue [Re: southtexas] #15671314 01/17/21
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The die squeezes the neck around a mandrel. The brass thickness shouldn't matter, that would affect your outside neck diameter after sizing, not the inside diameter.
As 375Taylor said above, it sounds like you need to anneal your brass. The loose necks have probably been work hardened and are springing back excessively.
That, or you are not providing uniform pressure on your press stroke.


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Re: Lee Collet Die Issue [Re: southtexas] #15671579 01/18/21
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Seafire’s solution worked for me when I experienced that issue.


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Re: Lee Collet Die Issue [Re: southtexas] #15671839 01/18/21
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Thanks, guys...very helpful feedback!

Is there any concern of pushing the shoulder back and thereby screwing up headspace by screwing the die down lower?

Re: Lee Collet Die Issue [Re: southtexas] #15671909 01/18/21
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Originally Posted by southtexas
Thanks, guys...very helpful feedback!

Is there any concern of pushing the shoulder back and thereby screwing up headspace by screwing the die down lower?

The die doesn't affect headspace, so it won't be an issue.


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Re: Lee Collet Die Issue [Re: southtexas] #15671917 01/18/21
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I have several Lee collet dies that I have had to sand down the mandrel to get better neck tension.

Neil



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Re: Lee Collet Die Issue [Re: nmitchell] #15671944 01/18/21
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Originally Posted by nmitchell
I have several Lee collet dies that I have had to sand down the mandrel to get better neck tension.

Neil


Sounds like an issue that Lee should address!

IC-B

Re: Lee Collet Die Issue [Re: southtexas] #15672028 01/18/21
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Originally Posted by southtexas
Originally Posted by nmitchell
I have several Lee collet dies that I have had to sand down the mandrel to get better neck tension.

Neil


Sounds like an issue that Lee should address!

They'll sell you a mandrel for a nominal fee. Just need to specify the size you want.

OR you can cut down the one you have.

DF

Re: Lee Collet Die Issue [Re: southtexas] #15672089 01/18/21
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As mentioned, the brass might not be springing back consistently enough and may need annealed.

Every one of my LCD's with the standard mandrel sized brass with minimal tension. I have learned to order standard and undersize mandrels when I buy a new LCD, and sand the down the mandrel to "fit" different brands/lots of brass.


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Re: Lee Collet Die Issue [Re: southtexas] #15672090 01/18/21
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mathman Online Content
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Put a mic on the mandrel you have now and see what's what.


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Re: Lee Collet Die Issue [Re: southtexas] #15672109 01/18/21
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I find a .002 undersize mandrel is about right. I order from Lee when I order a new collet die automatically now.


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Re: Lee Collet Die Issue [Re: mathman] #15672280 01/18/21
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Originally Posted by mathman
Put a mic on the mandrel you have now and see what's what.


Ture. I have three standard size 6mm mandrels, none of them mic the same diameter.


Casey

Not being married to any particular political party sure makes it a lot easier to look at the world more objectively...
Having said that, MAGA.
Re: Lee Collet Die Issue [Re: southtexas] #15672873 01/18/21
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IIRC, the cost of a mandrel is around five bucks, or so. At least that's what I remember from a while back.

DF

Re: Lee Collet Die Issue [Re: southtexas] #15674141 01/18/21
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How can it be the mandrel when the OP said 60% of the reloads have tight necks/bullets? Technique and brass come to mind here.


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Re: Lee Collet Die Issue [Re: Sakoluvr] #15674167 01/18/21
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Yep, I have found the "springiness" of the brass has much to do with success when using LC dies.

And even though they're more tolerant of uneven neck thickness than expander-ball or bushing dies, uneven necks can still have an effect.


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Re: Lee Collet Die Issue [Re: Mule Deer] #15674468 01/18/21
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southtexas Offline OP
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Gentlemen: FWIW: I tried Seafire's advice and that seemed to do the trick.Still puzzled as to why some rounds were initially OK, and others needed an additional squeeze. Must be the "springiness" phenomenon.

Thanks again for all the assistance. That's why I hang around here!.

Re: Lee Collet Die Issue [Re: southtexas] #15675113 01/18/21
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Originally Posted by southtexas
Gentlemen: FWIW: I tried Seafire's advice and that seemed to do the trick.Still puzzled as to why some rounds were initially OK, and others needed an additional squeeze. Must be the "springiness" phenomenon.

Thanks again for all the assistance. That's why I hang around here!.


The simplest solution is always the best solution!


Casey

Not being married to any particular political party sure makes it a lot easier to look at the world more objectively...
Having said that, MAGA.
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