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Full length sizer versus Collet Neck Sizer

Discussion in 'Handloading and Reloading' started by CavVet, Apr 22, 2007.

  1. CavVet

    CavVet New Member

    Dec 10, 2005
    I knew this bottle neck reloading wasnt going to be easy.


    25 .308 cases in and my Full length sizer decapper is in two pieces. One piece down in the casing, the other in the full length sizing die.


    I notice the Collet Neck Sizer has a decapper in it. Do I want to use it? Should I have been using it in the first place?? Whats the difference???

  2. Jake in TX

    Jake in TX New Member

    Nov 7, 2004
    Ellis County, TX
    Well, it depends. If you are shooting the .308 in a bolt rifle, then the collet neck sizing die would be appropriate. If you are shooting the .308 in a semi-automatic rifle, then the answer is probably not. What brand of full length resizing die were you using? Did the decapping pin break off?

    Jake in TX
  3. snuffy

    snuffy Senior Member

    Apr 4, 2004
    Oshkosh Wi
    Too little information for us to help you out. Apparently you didn't do your homework before trying to load for a .308. Perhaps some reading is in order.

    Come back with a LOT more details, we can get this figured out for you.
  4. Ol` Joe

    Ol` Joe Senior Member

    Feb 25, 2004
    Sounds like the expander button was loose. I`ve had a die or two that I found this on, luck had it I noticed before I sized a case with them. The decapping pin looked off center in mine when this happened and called my attention to it. I don`t know if that is the case always or I just got lucky. I`ve since got in the habit of checking them when I clean and lube my dies, which is after every use as I store them in the basement which isn`t the driest place in the house.

    The difference between the Collet die and normal dies from RCBS, Redding, Lee, ect is the collets stem only decaps the case. The stem is acually a mandril that the collet works the case neck down around to size. The other dies both expand the neck back out to proper size after the die over sizes it down and decaps.
  5. Sunray

    Sunray Elder

    May 17, 2003
    London, Ont.
    "...One piece down in the casing, the other in the full length sizing die..." As in a broken pin or a pin that came out? Or is the expander in the die?
    Last edited: Apr 22, 2007
  6. stevekl

    stevekl Member

    Jul 31, 2004
    Richmond, VA
    A few questions:

    What brand of die? For my curiosity's sake.

    Did you lube the outside of the case? Did you lube the inside of the neck?

    To answer your question:
    -If the case you're reloading is new, you need to use the full length resizer.
    -If the case you're reloading has been fired in any chamber other than the one you're planning to fire it in, you need to full length resize.
    -If you fired the case in one rifle and plan on using it in another rifle, you need to full length resize.
    -If you plan to use the case in a semi-auto, you need to full-length resize.
    -If you fired the case in one rifle and plan to use it in the same rifle, you CAN use the neck sizer (or full length size).

    The point of the neck sizer is that when a case is fired in one chamber, it assumes the shape of that chamber, and therefore does not need to be full-length resized. It needs neck-sizing because there needs to be neck tensioning to hold the bullet.

    All chambers are different, even those of the same caliber, so you can't necksize a .308 you used in Rifle A and expect it to work in Rifle B (it MIGHT work if you're lucky).

    Why use a neck sizer in the first place? Convenience. Using a neck sizer requires no lubrication, and requires less force than full length resize. It is therefore a lot easier to run 50 cases through a neck sizer than it is to run 50 cases through a FL resizer.

    A tip: When you neck size, check to make sure the neck is small enough. A few days ago, I neck sized 50 .223 cases and when I went to seat bullets, I discovered that I did not apply enough force to the sizer, and I got no neck tension. Had to go back and neck size them again.

    Another tip: Don't apply too much force. I broke my neck sizing die by putting too much pressure on it (it's a Lee).

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