“It was more a matter of bullet construction than caliber.” That line from retired FBI firearms veteran Bill Vanderpool captures why one of the most argued-about handgun debates ended, at least inside ...

Both the 9mm and .300 Blackout are popular subsonic/supersonic carbine cartridges that can tackle some of the same jobs.

What finally ends a caliber argument: louder claims, or better data? The FBI’s return to 9mm was not a nostalgic swing back ...