RCBS Rifle Dies--FL vs. SB?

RCBS Rifle Dies--FL vs. SB?

This is a discussion on RCBS Rifle Dies--FL vs. SB? within the Reloading forums, part of the Defensive Ammunition & Ballistics category; Back me up on this--I'm new to reloading. I think I want the FL dies versus the short base (SB) dies. I would primarily be ...

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Thread: RCBS Rifle Dies--FL vs. SB?

  1. #1
    Senior Member Array Herknav's Avatar
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    RCBS Rifle Dies--FL vs. SB?

    Back me up on this--I'm new to reloading. I think I want the FL dies versus the short base (SB) dies. I would primarily be loading for bolt action and service rifles.

    Thanks in advance.

    Herk


  2. #2
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    Now, most of my dies are Lee ... but I will assume here you are having the choice of full-length resizing dies or neck sizing.

    If in fact you use same brass always in same gun then you will get much longer case life by just neck resizing. The case is already fireformed to a specific chamber and so does not need to suffer the ''trauma'' of full length resizing.

    If tho you want to reload a ''mixed bag'' - stuff for different guns in same cal - and don't want to keep them separate - then full length is maybe safest bet - but in the end having both is good.
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    Short based dies are used for maximum accuracy in bolt action rifles as it only sizes the neck enough so that it retain the bullet. The body is not resized, so that the fit to chamber will be excellent if already fired once in that chamber.

    They will not work for semi automatics that have enough clearance in them to properly work. For that you need to use the Full length re-sizer. If you don't, you will get alot of failures to go into battery...which means that your bolt wont push the shell far enough up into the chamber to get it to fire.

    If you are going to use your brass for several different rifles...you the FL re-sizer.If using just one bolt action rifle and going for accuracy...use the Short Base re-sizer.

    make sense ?
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    VIP Member Array frankmako's Avatar
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    i use full. for all of my match rifles i use fl dies. it does the job for me.
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  5. #5
    VIP Member Array Tubby45's Avatar
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    The small base dies are used for semi-auto and lever actions to promote smooth feeding. RCBS recommends against their use in bolt action rifles. Use either the FL sizer or a neck sizer and use a FL sizer when needed. Unless you are measuring you groups in inches at 600y or more, FL sizer will suit your needs the best.
    marcclarke likes this.

  6. #6
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    Tubby is exactly right. I brain farted on my post. I had just done a bunch of neck sizing for my .308 and mixed it up with "small based"dies. Duh.

    Neck size is for accuracy. Small based dies are for everything else. You cant use a neck sizer and expect it to work on semi's or levers though.
    I would rather stand against the cannons of the wicked than against the prayers of the righteous.


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