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So this is the deal.
You need to slug your bore. Aka lube you a dead soft lead bullet or round ball and drive it through the well lubed bore with a brass rod.
Now measure the major diameter with a micrometer. Not calipers unless you have a very precise set.
That’s you’re groove diameter. Size your bullets .001” or .002” over that diameter.
I run .357” for my 9mm and have had great luck doing so.

Miha makes his moulds to drop a proper size which is slightly over nominal cast Bullet size.
So the 9mm probably drop at 358 or so. Coating will add a little thickness also.

Better for them yo drop at .360” and size down .002” than a mould that drops too small.

[QUOTE="38ExtraSpecial, post: 7465538, member: 4457"] So this is the deal. You need to slug your bore. Aka lube you a dead soft lead bullet or round ball and drive it through the well lubed bore with a brass rod. Now measure the major diameter with a micrometer. Not calipers unless you have a very precise set. That’s you’re groove diameter. Size your bullets .001” or .002” over that diameter. I run .357” for my 9mm and have had great luck doing so. Miha makes his moulds to drop a proper size which is slightly over nominal cast Bullet size. So the 9mm probably drop at 358 or so. Coating will add a little thickness also. Better for them yo drop at .360” and size down .002” than a mould that drops too small. [/QUOTE]

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