I tested some 10mm auto loads a few days ago. Used 200 grain cast lead flat nose with gas checks on top of AAC #9. Achieved 1140 fps with AAC #9 and right at 1100 with Blue Dot. I could possibly squeeze a bit more since I was not loading quite to maximum. This was in a 5” 1911 pistol. I guess achieving 2000 FPS with a 10mm in a carbine with a 100 grain bullet is cool, but shooting a bullet that is relatively light even for a 9mm, well, I guess that is not that impressive to me...but that is my opinion.