Accurate No. 7 is a double base, Spherical propellant originally developed for .38 Super Auto ammunition. It has become a favorite propellant for IPSC shooters who load the .38 Super Auto. Somewhat more specialized in applications than No. 2 and No. 5, it is well suited to high intensity cartridges, such as .357 Sig. The popularity of No. 7 has increased dramatically since its introduction in 1983. It is a good choice for magnum handgun cartridges (such as .357, .41 and .44 magnum) when slightly less than full power loads are preferred.