New to casting and coating.

what does pc'ing have for thickness?
found some .379 bullets, but a rifle has .379 grooves, Would these shoot best as is or with the extra size after pc'ing?
Depends.

Hardness of lead, there is always some obturation when the cartridge is fired. You may be ok???

Pc can add up to three thou depending on the type of pc. You can also do multiple layers.
With adding pc, you may be ok???

Only real way of knowing what works for your gun is to actually shoot some bullets
 
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