One of the greatest debates in the firearms community is what ammo is best.

Different situations call for different ammunition, but, by and large, experts and law enforcement lean toward the 9mm round.

.45 ACP vs 9mm: 14 Experts Give Their Answers

In our April Ballistic round table, 14 experts — ranging from ex-military to industry scientists — gave their expert opinion on which round is more effective: 9mm or .45 ACP.

Many experts cited advancements in technology for the unanimous decision: the 9mm.

Check out the gallery on to see how each expert voted.

7 Reasons Why Cops Choose the 9mm Over the .40

Another ammo comparison is the 9mm round and the .40 round. Again, the former triumphs.

Law enforcement tends to lean toward the 9mm for several reasons, including cost and increased capacity — similar considerations that the experts in the previous column had.

See all of the reason why police choose the 9mm round on

Ammo Change: FBI Switching Back To 9mm Rounds

More recently, the Federal Bureau of Investigation announced that it would be switching back to the 9mm round.

The FBI used the round until a 1980s shootout with a suspect that left two agents dead. The Bureau cited penetration as a major problem with the round, but current technology has the FBI thinking otherwise.

Read more about the FBI’s ammo change on

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