The United States Army Proving Grounds in Aberdeen, Maryland might have some information. Also, try some organizations that approve it for use such as the FBI HRT, Los Angeles Police Department (SWAT and Select Uniform units), Los Angeles County Sheriffs Office (SWAT), and Texas Department of Public Safety. Numerous other organizations have the 1911 on their approved list.
I believe that what you need to do is elucidate the issue with your chief with empirical data and endorsement by other chiefs. Additionally , underscore the willingness of the rank and file to train relentlessly, even on off duty time, to become proficient with this firearm. Express willingness to seek training outside of the organization (even at personal expense) to gain proficiency.
I authorize it for my staff only if they show this alacrity and follow though.