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Make it big enough in diameter and make it so it fits the neck and throat exactly.
I start by designing a perfectly fitting, groovless wad cutter that when seated to the bottom of the neck, engraves the lead angle perfectly.
Then I add a GC shank so it does not change the length of the wad cutter.
I did follow those rules but used an existing designed nose. I also experimented with the base – this is to be a PB boolit. basically removed all but 0.020″ of the GC shank. Gives several advantages, primarily a good flat base with crisp edge – defined by the shank bevel – an area I can cast (or cull) very well. I’m pushing accurate 2100 fps in BO, 1800 in 308MX. Also is self aligning for seating boolits.