The Webley Mk IV in .455 caliber is a beast of a sidearm, delivering a powerful and authoritative presence both in hand and in its ballistic impact. Chambered for the .455 Webley cartridge, it fires a 265-grain lead bullet at a velocity of around 600 to 650 feet per second, generating a muzzle energy of approximately 300 foot-pounds. While not as fast as the shattering chaos of an express train smashing through a plate-glass window, the Webley Mk IV in .455 delivers a punch with an undeniable sense of weight and authority. The large, slow-moving projectile is akin to a wrecking ball—less about speed and more about blunt-force devastation. Upon impact, it creates a substantial wound channel, prioritizing stopping power and energy transfer over deep penetration. In close quarters, its performance is dramatic and effective, capable of ending a confrontation with a single, thunderous shot, or 5 more, as required.