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Well I hope your project will come together for you but keep in mind solids generally just punch a hole. If you want something cheap as a reference for expansion you can purchase some Winchester Power Points and use a counter boring center bit in the tailstock to drill a counterbored hollow point. Drill until the hollow just touches the inside of the mouth of the jacket. This will give you a broad nose opening that will funnel a lot of material down into the smaller drill bore and will create a hydraulic action that will split the scored power point jacket very quickly. Very very effective at medium to high velocity. For subsonic you will have to tinker with it.
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