The .45 ACP (Automatic Colt Pistol) round is a popular handgun cartridge known for its stopping power and widespread use in military, law enforcement, and civilian applications. The FMJ (Full Metal Jacket) Round Nose is one of the common configurations for this caliber.

Here's a breakdown of its features:

1. Caliber: .45 ACP denotes the diameter of the bullet in inches (0.45 inches). It's a relatively large and heavy bullet compared to other handgun calibers, which contributes to its stopping power.

2. FMJ (Full Metal Jacket): This refers to the design of the bullet where the lead core is completely encased in a harder metal, typically copper. The jacket covers the entire bullet except for the base. FMJ rounds are favored for target shooting and training because they provide reliable feeding and less fouling in firearms compared to other bullet types.

3. Round Nose: The bullet profile is rounded at the tip, which aids in feeding and chambering. This design also tends to penetrate targets more efficiently compared to other bullet shapes like hollow points, making it suitable for certain applications such as military use.

Overall, the .45 ACP FMJ Round Nose is known for its combination of stopping power, reliability, and penetration, making it a popular choice for self-defense, target shooting, and military applications.