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Normal Topic Neck size vs FL size die (Read 583 times)
stagstalker
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Neck size vs FL size die
Jul 22nd, 2018 at 5:44pm
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Newbie question.

What is the key differences and when would you use them? I understand the FL sizing die also sizes the neck so why would you need a seperate neck sizing die?

I am trying to decide if I can just buy a two die set (seater and FL) or if I should get a three die set (seater, FL and neck).

Thanks.
  

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Re: Neck size vs FL size die
Reply #1 - Jul 22nd, 2018 at 7:19pm
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The FL is mainly for when you buy once fired brass and not sure of the chamber so you run it through the Full Length first and after it's been through your rifle then Neck Sizing die only.

For new unused brass... Neck Sizing only is the way i go.

For what your wanting to do... just get a "Neck Sizing" & a "Seating" die set  Cool
  

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Re: Neck size vs FL size die
Reply #2 - Jul 22nd, 2018 at 8:07pm
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Buy the 3 die set because even if you neck size only, typically (not with every cartridge type but typically) after approx 5 loadings/firings due to brass expansion you will find it hard to chamber and close the bolt. FLSing is then required.
There are also strong views re neck sizing only versus FLS'ing every load. It is a perennial topic on forums worldwide. The neck sizing guys say the fired case once neck sized only will nicely fit the chamber which in theory assists projectile alignment with the bore and therefore accuracy. There are also serious target shooters who anneal and FLS every loading and get superb accuracy.

Google FLSing versus neck sizing for fun.
  
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Re: Neck size vs FL size die
Reply #3 - Jul 22nd, 2018 at 8:25pm
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Neck sizing for brass that has been fired in your rifle (or new brass) and will be fired in the same rifle.
Full length sizing for brass that has or will be fired in another rifle, or in semi-autos, lever actions.
FLS every time covers everything, but works the brass more so may reduce case life. I neck size for my bolt actions, and full for the lever action. I have started using a Lee collet die for neck sizing, supposedly is better for brass life, but a big bonus is no lube is needed, so easier and no lube to remove after sizing
  
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Re: Neck size vs FL size die
Reply #4 - Jul 22nd, 2018 at 9:01pm
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That makes good sense. Thanks guys.
  

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Re: Neck size vs FL size die
Reply #5 - Jul 22nd, 2018 at 10:17pm
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Both practices have merit and have their adherents.

I run a slightly different routine:

- always neck size with a collet die (after neck turning new brass for the first load).
- never use an expander ball with my sizing die (use an expander mandrel instead).
- always use a bump die to knock the shoulder back one or two thou.

I never FL size.

Its a bit more involved than many can be bothered with but works for me. I only turn necks for the first load, which takes about a minute per case and gives consistent neck tension.

Im trying to get the best consistency I can every time, so I use the same process that sizes my brass the same for every load.
  
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