Lyman 429421 Dropping Small Boolits

[thunderboomer]

Hello, New here and this is my first post. A little experience casting, just enough to be frustrated.

Question, I have an older Lyman 429421 that I was dropping boolits at .4335 and have since used those boolits in a S & W 24-3. Throats are .4330. I was using a 50/50 mix of Linotype and pure lead.

Today, I set up to replicate the original boolits and they are dropping at .4309?? What am I doing wrong? Boolits are filled out, sharp corners in the grease groove etc...

Any ideas?

Thank you.

[Yodogsandman]

Welcome to the forum!

Try running your mold hotter (faster cadence) if the alloy is the same.

[Fluxed]

Different alloy?
Compared to your original alloy, lesser amounts of tin and antimony will give smaller bullets.

[thunderboomer]

I made sure my alloy was the same, Linotype was from the original ingot, and the pure lead came from the same source. I mixed it by weight.

I will try a faster cadence! Also the temperature is set at 820 using a Lyman digital 25 furnace.

Thank you.

[runfiverun]

woah turn that down.
2/6/ alloy will cast just fine at 675-f and won't burn out the tin. [okay oxidize]



I'm surprised your getting boolits that big.

[44man]

Too hot makes SMALLER boolits. Then let them age, if you water drop they will age sooner and they will grow in size. Air cooled takes longer.
The bad thing about linotype is there is no arsenic present so it will not harden like WW metal does. I also do not know what that lack does to expansion.
Your largest boolits will be shiny, filled out and no wrinkles. As you approach frost, they will be smaller.

[44man]

Actually a .431" boolit should shoot, there is no good reason to ever shoot over throat size.