Bullet weight ????

[Kurt]

You can really close the variances when casting.
I cast with a very tight sprue plate and I have no problem getting the base or nose whatever the mould be to fill properly. I use a .100" hole for my sprue plate. The voids are usually the slag getting into the cavity especially with very large holes in the sprue plate.
I take a rag that has lube on it and wipe the spigot on the ladle this keeps the scum that is floating on top of the alloy from sticking on it that gets poured into the cavity.
I can tell just by looking at the sprue puddle if that bullet is light or right on by the way the sprue shrinks as it cools.