But seriously, folks......
We should welcome our brethern from lesser places; how else can they learn?
It would have potential for the 40 Super [does that need an "(R)"?).
But I have some concern, perhaps unfounded, about setback in the bottlenecked case.
I think a plastic sabot would not hold in the neck as well as a metal bullet.
Now if the sabot had a (potential) crimp groove, then the case mouth could be roll-crimped into it.