Originally Posted by dkf
Same applies for .40 +P and .380+P then.
Not quite.9mm +P+ has a 30 year track record of being used safely in modern pistols. 40+P and 380+P don't.
Companies made up the designation to sell ammo. Their own way of indicating a "hot" load to the consumer whom does not know the difference.
Nope. 9mm pressure had been nudged down by SAAMI to prevent damage to old pistols of questionable strength and quality some of which had been chambered for lower pressure cartridges like 9mm Largo.
Police Depts demanded hotter 9mm ammo and Winchester, Federal and Remington responded by
1. providing the ammo,
2. designating the ammo as +P+,
3. having the Depts sign a waiver to get it and
4. not selling the ammo on the open market.
The process was similar to the introduction of the 38 Super except the Super was intended to be sold on the open market. Colt did not make up
the Super designation to sell ammo.
They called it 38 Super to differentiate it from the lower pressure 38 ACP and discourage its use in the weaker Colt 1900 pistols.