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Thread: "optimum" Brinell hardness & Missouri Bullets - WARNING - MATH !

  1. #41
    Boolit Master mehavey's Avatar
    Join Date
    Aug 2012
    there is no explanation on the site about what that number (1422 x .90) represents.
    First, one needs to know the definition of a Brinnell #: It is literally the pressure (Kg/mm-sq) at which point the alloy begins to deform.

    Take a look here:

    The "1422" number comes from converting kg/mm-sq to lbs/in-sq = 1422.332639

    The 90% comes from getting real close to (but not over) yield pressure where the alloy just lets go on you.

    Be that as it may, however, I've found using a 1.3 multiplier (rather than 0.9) gets me in the ballpark -- adjust from there.
    I STRONGLY NOTE: that using a softer alloy is more often than not the best route to go
    Last edited by mehavey; 07-14-2018 at 07:31 AM.

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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