As he said up there ^^^. Group called SAAMI establishes standards on size, pressure for sporting cartridges. 4 cartridges have a separate loading, designated +P- loaded to a higher pressure. Those 4 are 9mm Parabellum, .45 ACP and .38 Special. ALL .38 Super ammo is considered +P, since it is a hotter loading than the parent, .38 Auto.
There is NO OFFICIAL standard for +P loadings in any other cartridge, nor any official standard for calling something +P+.
9mm 35,000 psi
38 Special 17k
45 ACP 21K
.38 Auto 26.5
.38 SUPER 36.5
What we have here is... failure- to communicate.
Last edited by c3shooter; 03-06-2013 at 10:34 PM.