Which sizing die?

Discussion in 'Reloading' started by Sevy, Sep 11, 2018.

  1. Sevy

    Sevy Well-Known Member

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    Up until this point I have always fl sized for my 300 win mag. I was having some trouble with the die and did something stupid and screwed it up. I was wondering about neck sizing, read a little about it but would like a little more insight. From what i can find a belted case should be treated differently than a non belted case. Should I buy a new fl size and stay with that or give neck sizing a try? Maybe some pros and cons would help.
     
  2. elf

    elf Active Member

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    Belted cartridges headspace on the belt, but that has no effect on FL sizing. FL sizing means moving the shoulder back a few thous.You can buy a neck sizing die that will
    do this or buy a set of Ski Ottos die shims from Sincliair. Simply place one of the smaller shims under the FL
    die, run it up and check the shoulder set back. If not enuf, try a thicker shim. Do so until the empty case chambers smoothly.
     
  3. Gord0

    Gord0 Well-Known Member

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    I use a Lee collet neck die for my 300win along with a body bump die. They will chamber smoothly with just neck sizing for about 6 firings in my rifle with the load I'm running. After that I size the body and bump the shoulder back .002" and start the process again.
     
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  4. AZShooter

    AZShooter Well-Known Member

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  5. elf

    elf Active Member

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  6. Sevy

    Sevy Well-Known Member

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    Thanks az shooter. I think the bushing does in that thread may be a little over my head. What Gordo is suggesting is more what I think I am looking for. Using a collett neck die should work the brass less and therefore it should last longer correct? If just neck sizing for several firings is annealing necessary?
     
  7. Gord0

    Gord0 Well-Known Member

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    It does work the brass a lot less. I have never trimmed in 8 firings in my 300win. They have grown around .003". I do anneal every 3rd firing, but it's because I have access to an induction coil to do it and it only takes a few seconds. I'm also not shooting hundreds of rounds at a time.
     
  8. Sevy

    Sevy Well-Known Member

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    I'm thinking I may need to start annealing. I thought I may try to build one. So when you neck size for six firings, on the seventh does the brass not chamber, then you know it's time to set the shoulder back?
     
  9. Gord0

    Gord0 Well-Known Member

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    They would still chamber, but the bolt was closing a little harder.
     
  10. Sevy

    Sevy Well-Known Member

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    Ok here is a stupid question. If I bought a neck die, can I use my old rcbs fl die with the expander and decapping pin removed to bump the shoulder when it comes time.
     
  11. Gord0

    Gord0 Well-Known Member

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    It would size your neck way too small. I took my old RCBS full length die, chucked it in the lathe, and ran a reamer through it. Now it won't touch the neck, and only size the body and shoulder.
     
  12. Sevy

    Sevy Well-Known Member

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    Ok. I will have to get a body die then. I don't have a lathe. I appreciate your help.
     
  13. Gord0

    Gord0 Well-Known Member

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    No problem. Something to also check out is the Forster full length sizing die. It does a really nice job keeping things concentric.
     
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  14. Gerard Schultz

    Gerard Schultz Well-Known Member

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    I have checked several hundred dies from several different manufacturers in a lathe with two dial gauges for runout. If you buy Forster, RCBS or any of the more expensive makes, you are usually ok. Get a full length sizing die and set it up according to this guideline.