subsonic Archives - Page 6 of 6 - Must-Have Information

The .45 ACP cartridge is known for its ability to function at velocities below the speed of sound, typically around 1,125 feet per second. Standard loadings often achieve this, making them inherently quieter than supersonic rounds. For example, a 230-grain bullet propelled by a standard powder charge will generally remain subsonic.

This characteristic is valuable for suppressed firearm use, as it eliminates the sharp crack produced by a projectile breaking the sound barrier, enhancing stealth and reducing noise pollution. Historically, subsonic performance was a key consideration in the .45 ACP’s development in the early 20th century, contributing to its adoption by military and law enforcement agencies. The inherent subsonic capability, combined with heavier bullet weights, also influenced its reputation for effective stopping power.

.45 ACP Ammo: Subsonic or Not? Myth Busted

The .45 ACP cartridge is known for its relatively low muzzle velocity compared to other handgun rounds. While many loads are below the speed of sound (approximately 1,125 feet per second), achieving truly subsonic performance depends on several factors, including bullet weight, powder charge, and barrel length. A heavier bullet propelled by a standard powder charge is more likely to remain subsonic. Conversely, lighter bullets or higher-pressure loads can achieve supersonic velocities.

Subsonic ammunition offers specific advantages for suppressed firearms. When a projectile breaks the sound barrier, it creates a loud, sharp crack the sonic boom which negates much of a suppressor’s effectiveness. Using rounds that remain below the speed of sound significantly reduces noise, a critical requirement for military special operations, law enforcement, or civilian recreational shooting where noise reduction is prioritized. The .45 ACP’s inherent tendency towards lower velocities contributes to its suitability for suppressed applications.