From Ammo to Go:

Sometimes in the shooting industry, a new cartridge will skyrocket the sale of a specific rifle or handgun. On occasion, the opposite occurs. A new weapon will breathe life into a previously forgotten (or at least, neglected) cartridge. This is the case with the new pistol from Ruger, called the “Ruger 57.” As buzz builds and ownership of the pistol picks up, we thought a 5.7×28 vs. 9mm caliber comparison would be a good way to get a feel for what the round is capable of.