The 4/11/86 Miami shootout was a watershed event in Bureau history. I would urge anyone interested to check the actual documents created in its wake for the real facts:
Federal Bureau of Investigation - Freedom of Information Privacy Act
The first section (1A) lists the guns used in the shootout by make, model, and serial number (pages 66, 70), as well as the types of ammunition used. The agent's .38 ammo is described uniformly as lead +P semi-wadcutter hollowpoint. The crime scene guys recovered a speedloader full of Bureau .357 Silvertip from a g-ride, as well as some loose wadcutters probably left over from a qualification session.
Supervisory Special Agent Gordon McNeil carried a personally owned Model 19-1, serial number 6K29169. SA Mireles carried a personally owned 4 inch 686 - serial number AAH8939. There were also Model 13s, 36s, 60s, and 459s.
Some of the stuff is blacked out, but what is there is pretty eye opening.
There's also a good summary and another account of the guns in Part 02.