.454 Casull

.454 Casull
Comparison of handgun rounds. Left to right: 1) 3 in 12 ga magnum shotgun shell (for comparison), 2) size "AA" battery (for comparison), 3) .454 Casull, 4) .45 Winchester Magnum, 5) .44 Remington Magnum, 6) .357 Magnum, 7) .38 Special, 8) .45 ACP, 9) .38 Super, 10) 9 mm Luger, 11) .32 ACP, 12) .22 LR
Type	Handgun
Place of origin	United States
Production history
Designer	Dick Casull and Jack Fulmer
Designed	November 1959
Specifications
Parent case	.45 Colt
Case type	Rimmed straight
Bullet diameter	.452 in (11.5 mm)
Neck diameter	.480 in (12.2 mm)
Base diameter	.480 in (12.2 mm)
Rim diameter	.512 in (13.0 mm)
Rim thickness	.057 in (1.4 mm)
Case length	1.383 in (35.1 mm)
Overall length	1.77 in (45 mm)
Primer type	Small rifle
Ballistic performance
Bullet mass/type Velocity Energy 240 gr (16 g) JHP 1,900 ft/s (580 m/s) 1,923 ft⋅lbf (2,607 J) 300 gr (19 g) JHP 1,650 ft/s (500 m/s) 1,831 ft⋅lbf (2,483 J)
Test barrel length: 7.5 in Source(s): Handguns Magazine

The .454 Casull (pronounced Ka-Sool) is a firearm cartridge, developed in 1957 by Dick Casull and Jack Fulmer. It was first announced in November 1959 by Guns and Ammo magazine. The basic design was a lengthened and structurally improved .45 Colt case. .45 Colt cartridges can fit into the .454's chambers, but not the other way because of the lengthened case (very similar to the way .38 Special cartridges can fit into the longer chambers of a .357 Magnum and .44 Special cartridges can fit into the longer chambers of a .44 Magnum). The new Casull round uses a small rifle primer rather than a pistol primer, because it develops extremely high chamber pressures of over 60,000 CUP (copper units of pressure, not to be confused with pounds per square inch) (410 MPa), and a rifle primer has a significantly stronger cup than a pistol primer. The .454 Casull can deliver a 250 grain (16 g) bullet with a muzzle velocity of over 1900 feet per second (580 m/s), developing more than 2000 ft·lbf (2.7 kJ) of energy, although energy levels from common .454 revolvers with 7-8 inch barrels are typically somewhat lower (1,600-1,700 ft·lbf). The round is primarily intended for hunting medium or large game and metallic silhouette shooting.

The cartridges were originally loaded with a triplex load of propellants, which gave progressive burning, aided by the rifle primer ignition, resulting in a progressive acceleration of the bullet as it passed up the barrel.

The recently introduced .460 S&W Magnum cartridge has the same diameter as a .45 Colt or .454 Casull, and therefore revolvers chambered for it will also chamber the .454 Casull and .45 Colt. Until the introduction of the .460 Smith and Wesson Magnum, and the .500 S&W Magnum, the .454 Casull was the most powerful commercially produced handgun round on the market, significantly eclipsing the newer .50 AE.

See also

• List of handgun cartridges
• List of cartridges by caliber