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The 1955–1962 Blackhawks are known today as the "Flattop" models, because their adjustable rear sights were not protected by "ears" extending up from the frame as later became standard. From 1962 through 1972, Ruger made the "Three Screw" Blackhawk in various calibers, so called by the number of screws visible on the side of the revolver.
Guns designed for the .357 Maximum were built on a larger frame than their predecessors. Although Ruger only made about 7,700 Blackhawks chambered in .357 Maximum, the frame size has been used as a base gun to build bigger revolvers in .375 SuperMag, .414 SuperMag, .445 SuperMag, .475 Linebaugh Long/Maximum, and .500 Linebaugh Long/Maximum. [9]
Although not originally designed for handguns, several rifle and shotgun cartridges have also been chambered in a number of large handguns, primarily in revolvers like the Phelps Heritage revolver, Century Arms revolver, Thompson/Centre Contender break-open pistol, Magnum Research BFR, and the Pfeifer Zeliska revolvers.
As the cartridge was noticed by competitive silhouette shooters during the 1970s, Ruger Blackhawk revolvers were chambered for the round, and several barrels were made for the single shot Thompson/Center Contender Pistol. Rounds made for the Contender could utilize longer bullets seated further out than was possible with the revolvers.
The Ruger Blackhawk revolver chambered for the .30 carbine round has been in the catalogs since the late 1960s. Standard government-issue rounds reach over 1,500 ft/s (460 m/s), with factory loads, and handloads producing similar velocities or tuned for more efficient short-barrel performance without excessive blast.
The Magnum Research BFR is a single-action revolver manufactured by Magnum Research.Modeled after the Ruger Blackhawk, it is constructed of stainless steel and chambered for a number of powerful handgun cartridges, such as .460 S&W Magnum and .500 S&W Magnum; popular rifle chamberings, including .30–30 WCF, .444 Marlin, and .45-70 Government; and even .410 bore shotshells.
The Ruger Old Army is a black-powder percussion revolver introduced in 1972 by the Sturm, Ruger company and manufactured through 2008. Models were available with either a 5.5 in (140 mm) or 7.5 in (190 mm) barrel.
From an 8.5 inch pistol barrel the 60 grain .256 Winchester factory load was advertised as having a MV of 2350 fps and ME of 735 ft. lbs. This was 250 fps faster and nearly twice as powerful as the .22 Remington Jet, a varmint cartridge for revolvers that was also based on a necked-down .357 Magnum case.