What to do with Group Buy alloy.

[20nickels]

Up till now I have only cast for .38 and .45 ACP plinking boolits from range scrap but have recently acquired a Lyman 358156 mould for my rifle and have a gas checked NOE 7.62X39 rifle mould on the way so now I want to step up and cast some nice hunting boolits with this group buy alloy;

Modified Wheel Weight Group Buy (2% Tin, 4% Antimony, .25% Arsenic)
http://castboolits.gunloads.com/showthread.php?t=63030

So the question is how do I mix or treat this for my rifle boolits and do I water drop or not? I have some roofing lead on hand if that's what I need to mix with. The much higher velocities and terminal ballistics involved are new territory for me so any other suggestions are appreciated.

[Bert2368]

That depends somewhat on how fast you want to push them. What cartridge is the .35 mold intended for? Is the 7.62x39 mold going to feed a semi auto you want to cycle normaly, or a bolt gun/single shot where you could run them slower?

That alloy was specifialy designed to be quench hardened. There are a couple of threads here and at LASC with info on hardness vs. intended use as well as heat treatment/quenching regimens to reach your desired hardness. I expect you WILL want to harden it, otherwise it's kind of a waste of money!

[20nickels]

For Marlin 1894 .357 mag 1800-1900 fps and SKS 7.62X39 GB 123 grain Spire ?fps . I would like to get as much velocity as possible in the SKS without leading.

[Bert2368]

You're probably going to need to water drop or heat treat for the 7.62x39 if you want to get the max possible velocity.

Is the Lyman 358156 a gas check or plain base? I find referances for that number both ways. Confusing! From a rifle at those velocities, I hope it's a GC design.

[20nickels]

You're probably going to need to water drop or heat treat for the 7.62x39 if you want to get the max possible velocity.

Is the Lyman 358156 a gas check or plain base? I find referances for that number both ways. Confusing! From a rifle at those velocities, I hope it's a GC design.

It is a gas checked design. Tks for the replies, I tend to just dive into things I'm interested in.