.45 round

 is an ammunition type in Fallout 4.

Characteristics
The .45 caliber round is a higher power alternative to the more common .38 caliber round; although the bullet travels slower than the .38 round, the sheer difference in weight allows the .45 round to transmit more energy, leaving a significantly larger wound cavity.

Weapons using this ammunition

 * Pipe revolver pistol and rifle
 * Combat rifle
 * Submachine gun

Locations

 * .45 rounds can be found on the bodies of Triggermen, Gunners and raiders that use the weapons listed above.
 * They can be bought from most weapon merchants.
 * They can be manufactured using an ammunition plant.