So, results, of a sort.
The 1.8 grain charge yielded about 680 feet per second; the 2.0 grain charge about 720-730.
Neither charge was sufficient to reliably cycle the slide of a 5" Springfield 1911 with the 10 or 11# recoil spring they're installing as stock.
There is sufficient pressure in both loads to flatten a Winchester primer pretty significantly - not to the point of turning the "inny" firing pin strike impression into an "outy", or to completely wipe out the radius at the outside of the pocket, but nearly so.
The jacketed range scrap + tin, 10 (ish) BHN bullet did not expand in my water jug test, and took seven jugs to stop. The nose was slightly compressed, but no outward mushrooming. Maybe taking it closer to dead soft, but as it's basically a .38 S&W at this point, probably not.
I think if you have the hollow BASE version of this mold that would allow something close to the reported 3 grains of Bullseye, this concept may be worth exploring. It's a gentle load, and the informal slaughter of cans and bottles indicates it may have pretty good accuracy chops as well, but as for it being a 9mm version of the .38+P FBI load, no dice.
But we've explored the ancient texts of Elmer. Flight of tinkering fancy accomplished. Will probably stick with my 135gr Ranch Dogs until the hollow point bug strikes me again.