Search the forum and you'll find several threads that deal with the subject.
imho poor planning and bad luck caused the deaths of two good men.
The controversy over hand gun ammo misses the point.
If the intent was to ram and pin a vehicle, larger vehicles should have been used. If you don't know how well your suspect is armed, your team should be as heavily armed as possible. Each pair should have had a long gun, rifles as well as shotguns.
http://en.wikipedia.org/wiki/1986_FBI_Miami_shootout