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Newb and a Lee Collet die

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Unread 02-03-2013, 03:00 PM
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Join Date: Nov 2011
Location: Southwest Virginia
Posts: 135
Re: Newb and a Lee Collet die

make sure the sizing collet is being pushed up when the shell holder touches it. For some reason the mandrel could be off center or siezed up inside the die itself and is not sizing the case. 25 ft/lbs is not a whole lot of force especially considering how long press handles are.
Basically, Take apart the die, clean it, make sure all parts are moving and that the collet moves when it touches the shell holder w/o a case in the die.
Learning every day.
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Unread 02-03-2013, 07:56 PM
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Join Date: Oct 2007
Location: Mountians of SW NC, near Asheville
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Re: Newb and a Lee Collet die

"What do I need to do."

Use your FL sizer. Neck sizing doesn't do a lot of good for any of us, if any at all, and especially not for new guys.

Most noobs have trouble with the Lee Collet neck die because they DO NOT adjust it correctly and, from your description, I suspect that's your problem too.
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Unread 02-03-2013, 09:47 PM
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Join Date: May 2009
Posts: 746
Re: Newb and a Lee Collet die

What make of press are you using ? I makes a difference . Lee press's don't usually cam over.
If you are using a Rock Chucker or clone follow my instructions Lee's instructions are not very good .

Using The Lee Collet Die.
I started using Lee collet dies when they first came on the market and have found that they are very good for the purposes for which they were designed .
I have found that there is a lack of understanding of how to use the die properly and as a result people fail to see the advantages that the die can deliver over standard neck sizing dies.
This is not the fault of the product , it is just a lack of understanding of how the die works and what it will feel like when you operate the press correctly.
Standard dies use a neck expanding ball on the decapping rod and size by extruding the neck through a hole and then drag the expander ball back through the inside neck.
The collet die achieves neck sizing by using a split collet to squeeze the outside of the case neck onto a central mandrel which has the decapping pin in itís base .
One advantage is that there is no stretching or drawing action on the brass.
The inside neck diameter is controlled by the diameter of the mandrel and to some extent by the amount of adjustment of the die and the pressure applied to the press .
This results in less misalignment than can occur in standard dies because of any uneven neck wall thickness in the cases .
Cases will last longer in the neck area and require less trimming. If cases have very uneven neck wall thickness then this can cause problems for the collet die they definitely work smoother and more accurately with neck turned cases but it is not essential.
When you first receive the die unscrew the top cap and pull it apart check that everything is there also that the splits in the collet have nothing stuck in them then inspect the tapered surface on the top end of the collet and the internal taper of the insert to make sure there are no metal burs that might cause it to jamb.
Next get some good quality high pressure grease and put a smear onto the tapered surface of the collet .
Put it back together and screw it into the press just a few threads for now . The best type of press for this die is a press of moderate compound leverage that travels over centre .
Over centre means that when the ram reaches its full travel up it will stop and come back down a tiny amount even though the movement on the handle is continued through to the stop .
eg. is an RCBS Rockchucker.
This arrangement gives the best feel for a collet die sizing operation.
Place the shell holder in the ram and bring the ram up to full height then screw the die down until the collet skirt just touches on the shell holder , then lower the ram .
Take a case to be sized that has a clean neck inside and out and the mouth chamfered and place it in the shell holder.
Raise the ram gently feeling for resistance if none , lower the ram.
Screw the die down a bit at a time .
If you get lock up ( ram stops before going over centre) before the correct position is found then back it off and make sure the collet is loose and not jammed up in the die before continuing then raise the ram feeling for any resistance , keep repeating this until you feel the press handle resist against the case neck just at the top of the stroke as the press goes over centre and the handle kinder locks in place .
This takes much less force than a standard die and most people donít believe any sizing has taken place .
Take the case out and try a projectile of the correct caliber to see how much sizing has taken place.
If itís still too loose adjust the die down one eighth of a turn lock it finger tight only and try again .
Once the die is near the correct sizing position it takes very little movement of the die to achieve changes in neck seating tension .
This is where most people come undone , they move the die up and down too much and it either locks up or doesnít size at all .
It will still size a case locking it up but you have no control over how much pressure is applied and some people lean on the press handle to the point of damaging the die. A press like the RCBS Rockchucker , that goes over centre each time gives you a definite stopping point for the ram and the pressure that you apply .
There is a small sweet spot for correct collet die adjustment and you must find it , once found , how sweet it is ! Advantages : With a press that travels over centre it is possible to adjust the neck seating tension within a very limited zone. No lubricant is normally required on the case necks during sizing .

If you still cant get enough neck tension to hold the bullet properly for a particular purpose then you will have to polish down the mandrel.
Be careful polishing the mandrel down and only do it a bit at a time as a few thou can be removed pretty quickly if you overdo it.
You can't get extra neck tension by just applying more force. The amount of adjustment around the sweet spot is very limited and almost not noticeable without carrying out tests.
For example , to go from a .001 neck tension to a .002 or .003 neck tension you would be talking about polishing down the mandrel.

There are some other advantages but I will leave you the pleasure of discovering them .
One disadvantage that I have found with the collet die is that it needs good vertical alignment of the case as it enters the die or case damage may result so go slowly.
Also some cases with a very thick internal base can cause problems with the mandrel coming in contact with the internal base before the sizing stroke is finished.
If pressure is continued the mandrel can push up against the top cap and cause damage . If you are getting lock up and cant get the right sizing sweet spot, then check that the mandrel is not too long for the case you can place a washer over the case and onto the shell holder and size down on that.
It will reduce the length of neck sized and give the mandrel more clearance. If it sizes Ok after adding the washer then the mandrel could be hitting the base.
This is not a usually problem once you learn how to use them .
The harder the brass is the more spring back it will have so very hard brass will exhibit less sizing than soft brass because it will spring away from the mandrel more. If this is happening to excess then use new cases or anneal the necks.
Freshly annealed brass can drag on the mandrel a bit in certain cases because it will spring back less and result in a tighter size diameter.
I have experienced it. I always use some dry lube on the inside and outside if I get any dragging effect . Normally you donít need lube.
I make up a special batch 1/3 Fine Molly powder. 1/3 Pure graphite. 1/3 Aluminiumised lock graphite. Rub your fingers around the neck and It sticks very well to the necks by just dipping it in and out and tapping it to clear the inside neck . After a few cases it coats up the mandrel .
Other dry lubricants would work also.
Use the same process for normal neck sizing also.

I noticed a definite improvement in the accuracy of my 22-250Rem. as soon as I started using a Lee collet die instead of my original standard neck die.
Readers are encouraged to utilize the benefits of responsible reloading at all times. Although the author has taken care in the writing of these articles no responsibility can be taken by the author or publisher as a result of the use of this information.
John Valentine. © 21/01/2002.
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Unread 02-04-2013, 12:22 AM
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Join Date: Apr 2012
Location: The cold part of Montana
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Re: Newb and a Lee Collet die

Funny that's nearly identical to how I set mine up, the only difference being, I have a Lee classic cast which has stops on the linkage, so once you hit the stops that's it.
Keep in mind the animals we shoot for food and display are not bullet proof. Contrary to popular belief, they bleed and die just like they did a hundred years ago. Being competent with a given rifle is far more important than impressive ballistics and poor shootability. High velocity misses never put a steak in the freezer.

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Unread 02-04-2013, 10:48 PM
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Join Date: Sep 2012
Posts: 6
Re: Newb and a Lee Collet die

I made slight progress this evening. I took it apart and it all looks good. There is some marks on the mandrel which makes me think it was binding up. I lubed it with a small amount of the Lee resizing lube that I had handy and ran my brass through again. I'm now showing a neck size of .283 to .2385.

I did watch that video several times and still believe I have the die set correctly. The die moves up fine with no case inserted and not that well once I put my case in. This is federal brass I'm currently using so I grabbed some Remington off the shelf and still had the same issue.

I think i should polish the mandrel and try it again sine this stuff is hunting ammo and will no doubt get tossed round a bit I don't think this is tight enough. Thank you guys for all the great advice. Does it sound like I'm heading in the right direction to you? Whats the best way to polish it. Thanks
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Unread 02-05-2013, 12:11 AM
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Join Date: Apr 2012
Location: The cold part of Montana
Posts: 1,391
Re: Newb and a Lee Collet die

I put a light coat of bearing grease on the outside of the collet it's self, were the die body squeezes the collet down. As ruff as those things come from lee a little touching up to smooth things out won't hurt either.
Keep in mind the animals we shoot for food and display are not bullet proof. Contrary to popular belief, they bleed and die just like they did a hundred years ago. Being competent with a given rifle is far more important than impressive ballistics and poor shootability. High velocity misses never put a steak in the freezer.

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Unread 02-05-2013, 03:59 AM
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Join Date: May 2009
Posts: 746
Re: Newb and a Lee Collet die

Polish up the inside of the case necks also. Get an old worn bore brush and wrap a small amount of steel wool around it and then chuck it in an electric screw driver . Give each case neck a few goes in and out .
That should reduce drag on the mandrel .
Another trick is size it once and then rotate the case 90 degrees and do it again.
Another trick is place a washer over the case and onto the shell holder that will give partial neck sizing but it also makes it work better because it gets the collet edge away from the neck shoulder junction which is hard to size down compared to the open end.
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