I have the Redding carbide GRX die and used it on my current batch of 10mm. I also committed the sacrilege of using the Lee FCD and noticed some pressure on the round entering the die, indicating the carbide sizing ring was squeezing the cartridge. I plunk tested this batch in the DW 1911 and two Glocks with EFK after market bbls which are tighter than the stock ones. All plunked fine. I may get to the range tomorrow to test these.
These are seated at 12.50-1.255 and that's about as short as the Hornady bullets will allow.
I have good confidence these will work and am anxious to try. Hopefully tomorrow.