I have to disagree. The rules state the calibers that qualify for ESP, 45 is not one of them.
ENHANCED SERVICE PISTOL DIVISION
Handguns permitted for ENHANCED SERVICE PISTOL division must be Single Action or selective SA/DA and be of 9mm (9x19), (9x21), (9x23), .38 Super, .357 Sig, .40 S&W, .41 AE, 10mm Norma, .400 Cor-Bon and meet the following criteria: