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Thread: Tapered expander pin for rifle cartridges

  1. #1
    Boolit Buddy
    Join Date
    Apr 2005
    sulphur springs, Tx

    Tapered expander pin for rifle cartridges

    I use tapered pins held in a .30 cal collet to expand case necks to allow the cast boolits to be seated. I use 5/16 “ bolts and turn them in a drill motor with a flat file. .30 cal, 7 mm, .22 cal and turned a 3/8 “ bolt down to fit the .30 collet for a .375 expander. My question regards the neck tension obtained by using a tapered pin rather than a straight pin type expander such as a Lyman M die. I’m expanding the case mouth to the point of barely allowing the gas check to enter the neck. Does this allow enough neck tension for good ignition of the powder charge?
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  2. #2
    Boolit Master

    Join Date
    Mar 2013
    Northwest Ohio
    I use a home made die and tapered expanders ( Mine are turned from 1/2" 0-1) on cartridges I neck turn, The tapered expander is also the spud for my neck turners. I expand on it the use it to center the cutters when neck turning. I do need to lube the case necks doing this. I normally use bushing dies for loading and only size to what I need

  3. #3
    Boolit Buddy

    Dieselhorses's Avatar
    Join Date
    Feb 2017
    Southeast Louisiana
    Maybe you already knew but Lee offers a universal expanding die that will fit most calibers. Bear in mind, a mild taper crimp wouldn't hurt contrary to what many say if you are worried about pressure.

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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