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Thread: Can someone educate / explain "small base dies" to me?

  1. #21
    Boolit Buddy
    Join Date
    Jan 2016
    Posts
    416
    GONRA agrees wth Der Gebirgsjager's list of "small base die" calibers.
    In my experiece: Add 5.7x28mm FN too.

    Such RCBS resizing dies are valuable for producing "free chambering reloads" for semiautos.
    >>> VERY IMPORTANT to avoid Slam Fires!!!!! <<<

    None of that "neck sizing stuff" for Semiautos.....
    Free Chambering and CCI Military Primers are the way to go!

  2. #22
    Boolit Master

    Join Date
    May 2015
    Location
    easternshore of va.
    Posts
    1,803
    I use a small base sizing die on range brass the first time I size it for 308 and 223 brass just to avoid a swollen round not chambering .

  3. #23
    Boolit Master

    Join Date
    Oct 2009
    Location
    England,Ar
    Posts
    4,185
    Quote Originally Posted by Hardcast416taylor View Post
    I had the same problem with a Mark X Interarms, mine was in 7 mm Rem Mag. Robert
    I also had chambering problems with this caliber in a Mark X Interterms rifle. I shaved a few thousands off of the shell holder and painted it to make it easy to keep it separated from my other shell holders.

  4. #24
    Boolit Master




    bruce drake's Avatar
    Join Date
    May 2005
    Location
    Brownsburg, Indiana
    Posts
    4,002
    I'm dealing with this very issue with a new AR10 upper in 6.5 creedmoor. My other reloads for my Mauser 98 chambered in that same caliber has no problem loading the cartridges but the new rifle is a no-go with the older reloads while new cartridges cases and cases being fireformed from 22-250 cases are feeding and shooting perfectly fine. And the 6.5 Creedmoor's parent case is a 250 Savage necked up and blown out into an Ackley Improved case design so using 22-250 brass eliminates having to trim down 308 Win cases and the resulting neck trimming/doughnuts that the thicker brass causes.

    I ordered a RCBS 6.5 Creedmoor SBD Sizing Die from Midway and it should be here by Saturday for me to reform the older cases to the new rifle's chamber (I've already rebarreled the 6.5Creed 98 Mauser to a wildcat 22-6mm rem (5.56x57mm) for another winter project I have going on.) and then allow me to have dedicated brass for this rifle again.
    I Cast my Boolits, Therefore I am Happy.
    Bona Fide member of the Jeff Brown Hunt Club

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check