recently, i have found an interesting site , named "Missouri Bullet Company".
May be , some of you knows it, this site is a manufactures of cast bullets , near kansas city ...
on this site is a very interesting article on Hardness-Optimized Bullets, how to define optimal hardness , function of pressure :
https://www.missouribullet.com/technical.php
After reading article on this site, i had made some calculation
MBC Formula is : Optimum BHN = PSI / (1422 x .90)
As I use 405 Gr (45-70 gvt) bullet from Lyman mold 457193, and powered by IMR 4198 powder,
we have this in reloading table:
Lyman give pressure value in CUP; but correlation whith brinell hardness is in PSI/
Lot of people say that there is no correlation between this to method of hardness test , but there is one :
excellent document about this, from denton bramwell:
https://www.shootingsoftware.com/ftp/psicuparticle2.pdf
So, from 18300 PSI to 27500 PSI with MBC Formula :
It is the reason why i had make some cast bullet in brn 15, and i will make the more of them in brn 18, to use a medium charge of powder, because i don't need max power to make holes in paper
if i decide to begin boar hunt (a lot , too much, near my village) i will reconsider that
i hope to found chronograph at range in september.
i had build some excel sheet about alloy, casting and so on.
if somebody want it, il will send it ....
See you soon...
BruniX
Spring has sprung. Get out and shoot your Henry
Hardness-Optimized Bullets
- BruniX
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Hardness-Optimized Bullets
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"Those who forget the past are condemned to relive it"
W. Churchill
Shadow 2 SA - CZ
P08 - Luger
AR-15 - SDI
586 - S&W
97 - CZ
T3 Tac. - Tikka
1895 SBL - Marlin
1860 COLT - Pietta
W. Churchill
Shadow 2 SA - CZ
P08 - Luger
AR-15 - SDI
586 - S&W
97 - CZ
T3 Tac. - Tikka
1895 SBL - Marlin
1860 COLT - Pietta