This is a bit of advice I hadn't heard before. Repeatedly chambering the same round back into your autoloader can be a very bad thing.
I've heard that rotating the carry ammo is a good idea, but this states that using the same cartridge to charge the chamber over and over can drive the bullet deeper into the casing, eventually causing an over-pressure situation. Yikes!...
What is commonly known, and is referenced in the report, is that continuous loading of the same round(s) will eventually create an excessive pressure situation as the projectile is driven deeper into the case due to repeated contact with the feed ramp under force. As a .45 ACP round operates in the 21,000 psi range, projectile set-back may not create an over-pressure problem. When the S&W .40 cartridge, which operates at the 31,700-33,600 psi levels, several thousandths of set-back could generate enough of a pressure spike needed to disassemble the pistol.