.357 SIG 147 Grain TMJ~ The .357 SIG pistol cartridge (designated as the 357 Sig by the SAAMI is the product of manufacturer SIG Sauer in cooperation with Federal Cartridge It is used by a number of law enforcement agencies and has a good reputation of accuracy. Developed in 1994, the new cartridge was named “357” to highlight its purpose: to duplicate the performance of 125-grain .357 Magnum loads fired from 4-inch (100 mm)-barreled revolvers in a cartridge designed to be used in a semi-automatic pistol with greater ammunition capacity than a revolver.
Because of its relatively high velocity for a handgun round, the .357 SIG has an unusually flat trajectory, extending the effective range. However, it does not quite reach the performance of the .357 Magnum with bullets heavier than 125 grains (8.1 g). Offsetting this general slight disadvantage in performance is that semi-automatic pistols tend to carry considerably more ammunition than revolvers.
The Virginia State Police has reported that attacking dogs have been stopped dead in their tracks by a single shot, whereas the former 147 grain 9 mm duty rounds would require multiple shots to incapacitate the animals. Proponents of the hydrostatic shock theory contend that the energy available in the .357 SIG is sufficient for imparting hydrostatic shock with well-designed bullets. Users have commented, “We’re really impressed with the stopping power of the .357 SIG round.”
The bottleneck shape of the .357 SIG cartridge makes feeding problems almost non-existent. This is because the bullet is channeled through the larger chamber before being seated entirely as the slide goes into full battery. Flat point bullets are seldom used with other autoloader firearms because of feeding problems; however, such bullets are commonly seen in the .357 SIG chambering and are quite reliable, as are hollow-point bullets.
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- Velocity 1,220 fps