Alternative to 6.5 Grendel?

[Variable]

The E. Arthur Brown Company (eabco.com) sells sabots for .224 bullets in 30 cal cartridges. They also have loading info.
http://eabco.com/Reports/report04.html

eta: About 10 years ago, I contacted the company that makes the sabots and asked if he made 7mm->.224 or 6.5mm->.224 sabots. At that time he said that he didn't have any demand for them, so he never tried.

Maybe if we committed to a group order of a certain quantity (to cover their mold cost I'm sure), they might be willing to make them?