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Neck sizing with a F/L die

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  #8  
Unread 07-07-2009, 12:12 PM
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Re: Neck sizing with a F/L die

There are no dumb questions. They keep us from actually doing dumb things.

You can't neck size with a full length sizing die without also partially resizing the case, but you can size the case less by backing out the die until only about 3/4 of the neck is sized.

Screw your full length sizing die into the press and back it off one and a half turns. Mark a case with a magic marker from the case mouth down past the shoulder and run the case into the die. Look at the case. More than likely, you will see that the shoulder has also been in contact with the die, squeezing the case down a little smaller at the shoulder. This pushes the excess brass up the case where the datum line of the case contacts the corresponding datum line on the chamber. This is where you need to be setting your shoulder back about .0015" to ensure easy chambering. Play around with your die until you only size about 3/4 of the neck. If you can leave a small portion of the neck unsized, the unsized portion of the case centers in the chamber. You also size the case less than you would if you set up your die to size the entire neck.

If this works, you are in great shape. Your best bet is to use a body die and a Lee collet neck sizer.
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  •   #9  
    Unread 07-07-2009, 05:48 PM
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    Re: Neck sizing with a F/L die

    Thanks, that was a very helpful response. I will get a neck sizing die when I have $$, but partial F/L resize will work for now.
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      #10  
    Unread 07-09-2009, 11:32 PM
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    Re: Neck sizing with a F/L die

    I partial full resizing my 300, 338 & 375 RUMS. I just back my RCBS full size dies way back, resize and see if the brass easily chambers - I screw it down until it chambers.

    3-4 resizes are par for the course with RUMS. This technique will not extend your brass much if any - but it does fit the chamber better.

    I read in my sierra manual you can't do with with low taper cartridges like the .243 - so I guess I can't do partial sizing with my .308
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      #11  
    Unread 07-10-2009, 12:22 AM
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    Re: Neck sizing with a F/L die

    Quote:
    Quote:
    Originally Posted by RUMt View Post
    .....3-4 resizes are par for the course with RUMS. This technique will not extend your brass much if any - but it does fit the chamber better.
    You are only getting 4-5 firings our of your RUM brass?
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      #12  
    Unread 07-10-2009, 11:32 AM
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    Re: Neck sizing with a F/L die

    I forgot to mention that partial full length resizing can introduce another variable to your load. The further you back the sizing die away from the press, the less the case is supported by the die. You can easily get out-of-concentric loads. You have to start watching more carefully for runout.
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      #13  
    Unread 07-10-2009, 11:50 AM
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    Re: Neck sizing with a F/L die

    Years ago (I mean years ago) I read a very comprehensive article by some respected rifleman enumerating the reasons why it is a bad idea to partial size with a FL die; so I've never tried it.

    Naturally, I can't remember the specifics, but I think it had to do with introducing unwanted variables between case/chamber fit, as indicated above by Katbird, RUMt.l

    Last edited by LewisH; 07-10-2009 at 11:55 AM.
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      #14  
    Unread 07-10-2009, 01:02 PM
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    Re: Neck sizing with a F/L die

    A conventional neck die can help prevent body splits but not neck splits. The neck won't care if it's beng worked in a FL or neck die.

    Lee's Collet Neck Dies work the necks least of any and tends to produce straigher necks as well; I love them. I do NOT love bushing type neck dies of any kind for use in factory chambers.
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