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Thread: ?interchangability of Lyman & RCBS sizer-lubricator dies

  1. #1

    ?interchangability of Lyman & RCBS sizer-lubricator dies

    Are the dies for the Lyman 450 sizer/lubricator and the RCBS sizer lubricator dies interchangeable? Midway wants $2 more for the Lyman die in the same size--but $2 isn't worth a potential problem. TIA

  2. #2

    ShooterAZ's Avatar
    Join Date
    Jan 2012
    Flagstaff, AZ
    They say that they are interchangeable, but I have found that the Lyman sizer dies don't work too well in my RCBS Lam II. I don't know how well it works the other way around. You might have better luck than I did.

  3. #3
    Boolit Master

    Kraschenbirn's Avatar
    Join Date
    Dec 2006
    East Central IL
    I've got two Lyman 450s and a couple dozen sizer dies, mixed about 2-to-1 Lyman to RCBS; never had a problem with interchange. Call me 'frugal' but, when buying 'new', I always go with the one that carries the lowest price tag; also have bought a few 'used' at gunshows to lap/polish for oversize throats/bores without worrying about the name on the die.

    "I'm not often right but I've never been wrong."

    Jimmy Buffett
    "Scarlet Begonias"

  4. #4

    JonB_in_Glencoe's Avatar
    Join Date
    Mar 2010
    Land of 10,000 Lakes
    I am not a fan of RCBS dies, due to their internal groove that can catch a GC.
    But the few I have had, all fit and worked in my Lyman 45.
    I've never owned a RCBS LAM.

    Also, check prices at Optics planet for Lyman dies.
    some of the sizes are clearance price markdowns.

  5. #5
    Boolit Master
    Join Date
    Jan 2009
    I've never had a problem with my Lachmiller with either dies. But after getting a Star, the machine doesn't get much use.

  6. #6
    Boolit Buddy
    Join Date
    Jan 2018
    Sydney, Australia
    Both brands will work in the LAMII but my experience is that in some calibers with the Lyman you don't need to push the boolit as deep into the die as you do with RCBS dies. In order to get them to work i had to remove the locking nut from the depth stop screw so i could wind it in a little further to prevent the boolit going too far into the lyman die.

    The Lymans have 2 lube holes and the RCBS have 1. I have had better results using RCBS dies with boolits that have single lube grooves.

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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