The Redhawk holds six rounds of ammunition in its cylinder and until recently was available with a 4-inch, 5.5-inch, or 7.5-inch barrel. A 4.2-inch barrel was also recently added to accommodate the Canadian rules for minimum barrel length (the same was later done for the GP100 revolver). When introduced it was only offered in .44 Magnum/.44 Special. Later on .41 Magnum, .357 Magnum/.38 Special, .45 Colt, and .45 ACP/.45 Colt were added to the lineup. Gradually options in chambering were pared down, and by 2007 the Redhawk was again only offered in .44 Magnum. However, in 2008 Sturm, Ruger & Co. once again began marketing the Redhawk in .45 Colt chambering.