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In the case of the .45 ACP, the new standard cartridge pressure is 21,000 psi (145 MPa) and the SAAMI .45 ACP +P standard is 23,000 psi (159 MPa). This is a common practice for updating older cartridges to match the better quality of materials and workmanship in modern firearms.
Tables of Dimensions of Cartridges and Chambers (TDCC) The tables have been approved by the C.I.P. and contain the data needed to establish those technical standards, the aim of which is to meet all the C.I.P. Requirements for the proof of small arms.
C.I.P. 45 Auto TAB. IV Date 84-06-14 Country of Origin: US Revision 20-04-21 Alternative Names: 45 ACP CARTRIDGE MAXI Lengths L1 = L2 = L3 1) = 22.81 -0.25 L4 = L5 = L6 = 32.39 Case Head R = 1.24 R1 = 12.19 R3 = ... * Basic dimensions Dimensions in << mm >> Dimensions and Tolerances for Proof Barrels
SAAMI Pistol Cartridge Catalog. Here is a consolidate summary of all the pistol calibers that are currently recognized by SAAMI. The purpose of this is to provide a quick glance of cartridge specs for the curious mind. The SAAMI Maximum Average Pressure (MAP) is listed in both the Copper Units of Pressure (CUP) and the Pounds per Square Inch (PSI).
.45 Auto / ACP is the top end pistol cartridge that packs more energy than the 9mm, the 40 S & W, and of course the dinky 380 ACP. The only common pistol round more powerful is the .357 Magnum and the 50 Action Express (the 50 being not so popular really).
The 45 ACP shot cartridge was requested by the Air Force for use by air combat crews for survival purposes. Original approval was given on the 20th of August 1943 and was called the “Cartridge, Shot, Cal. .45, T23” and during October 1943 this cartridge was standardised as the M12.
Reputations aside, the 9x19mm has been proven to be, as effective as the 45 ACP at stopping threats, and to date it has become the preferred cartridge for about 60% Militaries and LEO worldwide. Still the 45 has at least one big advantage over the 9mm Luger.
