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“Plus-P” (+P) ammunition generates pressures in excess of the
pressures associated with standard ammunition. Such pressures
may affect the wear characteristics or exceed the margin of safe-
ty. Use of “Plus-P” ammunition may result in the need for more
frequent service.
“Plus-P” (+P) ammunition generates pressures in excess of the
pressures associated with standard ammunition. Such pressures
may affect the wear characteristics or exceed the margin of safety.
Use of “Plus-P” ammunition may result in the need for more
frequent service.
“Plus-P-Plus” (+P+) ammunition must not be used in Smith &
Wesson firearms. This marking on the ammunition designates that
it exceeds established industry standards, but the designation
does not represent defined pressure limits and therefore such
ammunition may vary significantly as to the pressures generated
If you have not already tried several standard pressure loads for feeding and accuracy (like the well-proven Federal 9BP), I'd try that before moving to + P. Factory + P will put more stress on the gun but you'll empty your wallet long before you'll wear your gun out.
I've never had a need to shoot +P ammo in any firearm I've ever owned, that's just me and my personal decision. I carry Winchester Defend 147 gr. JHP in my SD9VE. Again, I choose a heavier bullet load as my personal choice. My thinking is if I needed to carry a +P ammo in a 9mm; I should probably move up to a 357 magnum round in a different firearm. Again, just my opinion and my preference.
The OP's question was that of could and not should; hence my answer.
As far as why, well some people like to get more performance out of the round. It depends on the hollowpoint in question, but many work better at higher velocities (escpecially .38spl +P rounds which can have a big difference over standard pressure).
Just look at the law enforcement agencies that used .38 special rounds in 158 grain +P or 110 grain +P+. Many agencies used or still use 9mm 124 grain +P or 127 grain +P+ or 115 grain +P+.