Buy 50rds 357 Mag MAGTECH 158gr. Jacketed Soft Point Ammo Online. This Magtech.357 Magnum ammo is 100% non-corrosive, boxer-primed, and has completely reloadable brass casings. Each factory-fresh cartridge is loaded with a 158-grain jacketed soft point (JSP) bullet. With a muzzle velocity of 1235 feet per second and a muzzle energy of 535 foot-pounds, these JSP rounds provide controlled terminal expansion and exceptional accuracy. These rounds are an ideal option for locations that prohibit the use of hollow point ammunition and may be utilized for both hunting and self-defense. Buy 50rds 357 Mag MAGTECH 158gr. Jacketed Soft Point Ammo Online. Magtech was founded in 1926 and is committed to manufacturing high-performance ammunition. Magtech maintains complete control over each step of production and manufactures all of its components to assure quality and consistency. Designed and manufactured to exceed industry standards, Magtech ammunition offers an excellent blend of price and effectiveness. This kit comprises 50 rounds of.357 Magnum ammunition manufactured by Magtech.