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Neck sizing with a F/L die

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  #1  
Unread 06-28-2009, 07:22 PM
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Neck sizing with a F/L die

Can I neck size with a F/L Die? Do I simply back the die off so it no longer touches the shoulder? Or do I have to put up the extra $80 for a neck sizing die? thanks for the help in advanced, maybe its a stupid question.
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  #2  
Unread 06-28-2009, 08:01 PM
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Re: Neck sizing with a F/L die

First I raise the ram. Then i screw my RCBS FL die down till it touches the ram. Then back it out a 1.5-2 turns. I measure headspace with the RCBS precision mic. FL size the brass. Remeasure. I usually try and bump the shoulder back .002. If the shoulder gets squeezed back too much then I back out the RCBS die and keep trying. It make take a few pieces of fired brass to get it just right.

I don't know how to do it without the precision mic.

This is also not considered neck sizing but partial FL resizing. I don't know how to just size the neck.

Why am I even answering this post.
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  #3  
Unread 06-28-2009, 08:46 PM
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Re: Neck sizing with a F/L die

Maybe. Sometimes anyway. Depends a whole lot on 1) how you do it, 2) the case shape and 3) the actual dimensions of your die. If you die contacts any portion of the case so it changes it, you ain't neck sizing, you are only partial FL sizing.

1) There is no point in neck sizing below the base of a seated bullet.

2) You can easily neck size a steeply tapered case such as a 30-30 or .303 with a FL die. Not nearly so easy with a nearly straight case such as the WSM types.

3) If your chamber is on the small size of tolerance and your die is on the large size you might get away with it. Experiment to see how far down you will need to set the die to reach the bullet base. Then take another case, paint the whole body with a felt tip pin and try sizing, you won't need any body lube if it works. Run the case up the die until it gets tight, pull it out and check the body for ink reemoval. If the ink is scuffed off the body, stop and forget it. If not, figger the resistance is the neck. Repeat, push it further and remove again to check for rubbing again (don't want to stick the case, do we!).

If you can get the neck sized as far down as needed without rubbing the ink off the body, you are home free.
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  #4  
Unread 06-28-2009, 09:02 PM
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Re: Neck sizing with a F/L die

I guess if I explain what my curcumstances are, someone can probably help me more effectively. I have a .338 RUM, havent shot it yet. But when I was reloading for my .340 Wby I wasnt getting more than 4-5 firings. I think that this was from F/L sizing each time. So my thoughts were, only size the neck and I'll get better life due to less brass streching and I may get more capacity/ accuracy because the brass would be formed to my chamber already. Will a partial F/L size give me what I want or is that not goin to help with the case life issue because I'm still bumping the shoulder back? once again sorry if these are stupid questions.

Jordan
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  #5  
Unread 06-28-2009, 10:15 PM
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Re: Neck sizing with a F/L die

Why were you only getting 4-5 firings? Where was the brass failing? I shoot a 7mm mag mostly. I have to partial full length resize everytime or the brass won't fit in the chamber. It was worse on my factory tube than on my Shilien. I get 10+ firings. I usually pitch them after that. I havent started annealing. Yet.
I spoke with a guy from sinclairs and he uses the brass (300 wsm I think) five times. After that they go to a secondary box for plinking, foil a barrel ect.
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  #6  
Unread 06-28-2009, 10:42 PM
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Re: Neck sizing with a F/L die

I just bought a neck sizing die for my 338 rum and it was only about 30.00 If you shoot full power loads, don't expect a lot of loadings from the rum. Primer pockets usually start to loosen up. there is a tool however to tighten up primer pockets that seems to work well.
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  #7  
Unread 06-28-2009, 11:19 PM
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Re: Neck sizing with a F/L die

Im not sure why the brass were failing. They were cracking in the neck, on the shoulder, and occasionally right on the body. some of this brass was "once fired", but who knows. I had some new stuff do it too.
As far as die prices go, I'm in Canada so everything is more expensive. I think the Redding neck die is 69.99 + 12.5% tax (mind you I didnt shop around). Not only is it expensive but it usually takes awhile to get in.
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