Editing .45 Colt (section)

===Handloading===
Colt .45 revolvers made until early WWII had barrels with .454" groove diameters. After WWII diameters of .451–.452" were produced. Using .454" diameter bullets in the smaller barrels will work but will generate higher pressures. Cases used with .454" bullets may have to be full-length resized to work in newer guns.<ref name="Speer No. 10">{{cite book|title=Reloading Manual No. 10|date=1979|publisher=Speer - Omark Industries|location=Lewiston, ID}}</ref> Speer handloading guidance states that the loads they show should be used only in handguns made specifically for modern smokeless powder. The loads mentioned in No. 10 reloading manual state that they do not exceed {{convert|15,000|psi|MPa|abbr=on}}. This is the equivalent of +P loading as normal pressure for the .45 Colt is {{convert|14,000|psi|MPa|abbr=on}}.<ref name="Speer No. 10" />

In a section specifically titled '''"45 Colt for Ruger or Contender only"''' Speer makes reference to velocities up to {{convert|1,300|ft/s|m/s|abbr=on}} with {{convert|200|gr|g|abbr=on}} bullets. They also state that pressures do not exceed {{convert|25,000|psi|MPa|abbr=on}} (CUP). This is well beyond a pressure that can destroy even modern guns chambered in .45 Colt with the exception of the large frame Ruger Blackhawk, Ruger Redhawk, Freedom Arms Models 83 and 97, and Dan Wesson revolvers.<ref name="Speer No. 10" />