Hey there Balto,
I personally quench my cast WW bullets right from the mold and do so with most all the bullets I cast.
Normally I will be running 3 - 5 molds at a time - allows for cooling time between pours - depending on the outside temp.
I pour from an open pot using a bottom pour ladel, which is a big improvement over the typical edge pour type.
Anyway, you need to address some of your questions to Veral Smith at the LBT site or get his book on the subject.
I think one of his molds or possibly any mold with a wide and flat meplat will give you the needed shock value with little expansion. After all, you are already at .429 dia.
I have one of his molds, bought back a number of years, and it is without doubt the best mold I have or have ever used.
Keep em coming! :wink: