Casting Tara Corp Mag alloy, 92pb, 6sb, 2sn

[labop]

I started out at 710F and got some shrinkage mid bullet. Lowered the temp incrementally to 660 with the same results. Came back up to 775 which eliminates the shrink but now have whiskers, base is frosted and slow process time as the sprue must cool longer. Any words of experience in casting this alloy? Thanks

[ShooterAZ]

775 is too hot in my opinion. My optimum alloy temps have generally run right around 725* What boolit are you casting, and what type of mold are you using?

[labop]

Yes 775F seems to hot me. The bullet is 40 caliber, 400 grains in a steel mold.

[Vegas Vince]

I use many Lee molds as well as others & 650 to 660 works. Good fill & no frosting. Most I can cycle 3 times a minute. Largest boolit is 310 gr.

[labop]

I'm thinking now that the hole in the sprue plate is too small. I hesitate to modify it as it casts so well with 16-1 alloy. I am using a dipper, I might try bottom feed.