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Thread: 257roberts from 30-06 blanks

  1. #1
    Boolit Buddy Littlewolf's Avatar
    Join Date
    Apr 2012
    McPherson, KS

    257roberts from 30-06 blanks

    to explain what ive done
    first i cleaned the brass
    2nd trim the brass to 257rbts length in a forster original powered with a drill
    3rd slowly incriment form with 7/8" machine bushings (6bushings)
    4th deprime and expand mouths to 257
    5th turn necks to .0105" thick walls

    here is where my problems start
    all my lengths by saami specs and real 257rbts cases fired from said 257rbts rifle seem to jive. BUT dummies made from formed brass will not let the bolt into full battery. bolt handle reaches its notch in reciever but wont turn into battery.
    what can i try to fix this problem?

  2. #2
    Boolit Master
    Join Date
    Mar 2005
    You need to size the cases a little more.
    It is harder to push the shoulders back the last few thousandths with .30-06 brass. If you are using a C press you will have a worse problem.
    A .257 trim die works well but you can do it with a FL die.

    Just set your FL die to touch the shell holder.
    Size a case. Retract the ram about 1/2" and spin the case and size again. Repeat for 3rd sizing. Check fo fit in your rifle.

  3. #3
    Boolit Master

    HangFireW8's Avatar
    Join Date
    Dec 2008
    Central Maryland
    As EDG says it's probably just sizing the shoulder.

    Second idea is it could also be a tapered neck that is thicker at the base than the mouth. That could be either a neck turning issue or just a sizing issue.

    I guess there's a chance the OAL is wrong and the neck is interfering with the chamber step, but you seem to have that covered. Still, compare to the old genuine cases.

    Sometimes Full Length dies aren't tight enough, even if they stay in contact with the shell holder during sizing. In that case, get a Redding FL die, or a Small Base die, or file some off the bottom of your die, or off the top of your shellholder (the cheapest option). Then mark that SH carefully so you don't use it for anything else.
    Last edited by HangFireW8; 04-09-2018 at 08:17 PM.
    I give loading advice based on my actual results in factory rifles with standard chambers, twist rates and basic accurizing.
    My goals for using cast boolits are lots of good, cheap, and reasonably accurate shooting, while avoiding overly tedious loading processes.
    The BHN Deformation Formula, and why I don't use it.
    How to find and fix sizing die eccentricity problems.
    Do you trust your casting thermometer?
    A few musings.

  4. #4
    Boolit Buddy Littlewolf's Avatar
    Join Date
    Apr 2012
    McPherson, KS
    thanks guys i like the shellholder idea a lot. necks are forster turned to 0.0105" from mouth to shoulder

  5. #5
    Boolit Bub
    Join Date
    Dec 2008
    Stuck in Lodi
    The base of the 06 blanks might also be too large for your 257's chamber. You my need a body die also.

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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