We hashed this exact subject out quite a while ago on one of the Glock E-mail lists when the .224 Boz first came out. I think making anything close to the .224 boz will result in a law suit and no one will touch it including reamer makers, barrel makers, smiths etc.
I think the Sabot is the only way to go to test this theroy out. It is possible to make sabots out of solid plastic. A lathe is definaltly needed and possibly a mill. I have seen it done and it wouldn't be that hard with the right stuff. If anyone wants to discuss this project, mail me at firstname.lastname@example.org
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