Many handgun manufacturers that use plastic internal parts will caution against using +P and +P+ ammunition and 9mm Major loads, which generate even higher chamber pressures.
In tactical situations, velocity improves vest penetration, if not designed properly, it will affect hollow-point projectiles' behavior.
[1] The 9mm qualifies for Major scoring only in the Open Division of practical shooting competitions, where compensators and optical sights are permitted.
Open Division guns, often called a racegun, are purpose-built for high-powered, high-speed competition and can handle the high pressure of 9mm Major and .38 Super ammunition.
9 Major rounds operate at high pressures, typically at +P or even +P+ levels, necessitating careful gun design and appropriate gunpowder selection to ensure safety and optimal performance.
However, some flat nose bullets, such as hollow points, may cause magazine fitment issues if loaded to the maximum Sporting Arms and Ammunition Manufacturers' Institute (SAAMI) overall length of 1.169 in (29.7 mm).
Many racegun chambers have extended throats to support longer-loaded ammo, providing another reason why handloading is preferred for these specialty rounds.