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Andrew, Following is directly from page 11 of owners manual. Just says +P may cause more frequent service, but can use. But no +P+ ammo at all.----------------• “Plus-P” (+P) ammunition generates pressures in excess of the
pressures associated with standard ammunition. Such pressures
may affect the wear characteristics and 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
and could be DANGEROUS.

Andrew, no Sir. Standard SAAMI pressure ammunition only.