Silcone is not good for resizing cases, unless you want stck cases. What is needed is a hight flim strength lube, a wax based type like Imperial is one of the best as so little is required for sizing.
As for oils there will be 20-30 responses as to what is the best type to use. If you have a lot of dust then you have to clean more often, there is no magic lube that will perform like oil, stay dry and keep your guns lubericated.
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