My reading of the manual suggests that as long as it's +p loaded to proper SAAMI +p .45 standards, you should be okay. It's not directly addressed.
1. Use only high-quality, original, factory-manufactured ammunition. Do not use
cartridges that are dirty, wet, corroded, bent, or damaged. Do not oil cartridges.
Do not spray aerosol-type lubricants, preservatives, or cleaners directly onto
cartridges or where excess spray may flow into contact with cartridges. Lubricant
or other foreign matter on cartridges can cause potentially dangerous ammunition
malfunctions. Only use ammunition of the caliber for which your firearm is
chambered. The proper caliber is permanently engraved on your firearm; never
attempt to use ammunition of any other caliber.
2. The use of reloaded, “remanufactured” hand-loaded, or other non-standard
ammunition voids all warranties. Reloading is a science and improperly loaded
ammunition can be extremely dangerous. Severe damage to the firearm and
serious injury to the shooter or to others may result. Always use ammunition that
complies with the industry performance standards established by the Sporting
Arms and Ammunition Manufacturers’ Institute, Inc. (SAAMI) of the United States
or ammunition manufactured to military specifications.
Source:
http://www.sigsauer.com/upFiles/CmsC...ols_Manual.pdf