ah, fallacy
I started making Major Nine back when it was called that, and I make mine to SAAMI-length.
I did it with numerous bullet weights; I did it with more than one powder; I did it with anally inspected 'brass'.
I still make Major Nine (oddity: side by side loading of 9x19 and 9x21 with the ONLY variables being case, and crimp adjustment, taught me that MY loads were within 20fps, with the shorter case being the slower load. I am convinced the longer 9x21 case provides more time for powder burn due to increased case neck tension from its longer case).
I often use compressed loads, particularly for social ammo, to preclude any possibility of bullet set-back, which IMO would be catastrophic at these elevated Screw-SAAMI pressures.
To me, the possibility of things going bad suggest that the 38 Super family is a smarter choice.