Alloy mix .458 Socom 1800 fps powder coated

[Dadswickedammo]

Hey fellas got my dies brass molds now time to cast.
Casting 2 size
457 bullets 340&405gr will be powder coating running 1500 to 1850fps 18" barrel using lil gun and imr 4227.
I have pure lead a **** ton of linotype and tin.
Looking for a guide line on alloy mix.
Thinking around 5% antimony 4% tin 91% lead. That's my best guess.
Any advise??
Thanx

[xdmalder]

2.5% tin. 2.5% antimony. 95% lead

[Dadswickedammo]

Sweet. Thank you

[el34]

From the Rotometals website-
BHN = 8.60 + (0.92 * Antimony% ) + (0.29 * Tin%)

91/5/4 = 14.4 BHN
95/2.5/2.5 = 11.6 BHN

[Smoke4320]

95/2.5/2.5 = 11.6 BHN would work great in a big 300-350 gr bullet

I shoot a 325gr HP with a 48/48/2 CCWW, PB, HSB alloy very accurately at 1600 FPS . real deer killer
according to my alloy calculator this yields a 9.9 BHN
use it in 300 Blackouts going over 1900 FPS, 45/70 at 1575 ect ect

[John Boy]

Looking for a guide line on alloy mix.

Lyman #2

[Smoke4320]

for a very good alloy calculator

http://castboolits.gunloads.com/show...ad+calculators

[Dadswickedammo]

Very helpful thanx