45 ACP ELP INTELLIGENT PROJECTILE. HEADSTAMP WINCHESTER 45 AUTO. ELP 190 grain Intelligent Projectile, although created in late 2010 to help establish a pressure safety valve when testing the massive amount of 45 Semi Auto pistols being released with an extremely wide range of operating pressures. This 190 grain version was designed to know when to release the pressure at between 17,500 and 17,800 C.P.U.’s. These Intelligent Projectiles were used through 2014 as part of the product design tests for a wide variety of 45 Semi-Automatic pistols. Two sizes were developed in a 190 and a 215 grain version, the rest of the pressure variables were done by using different pressure release valve combinations (The Ball In The Hole Design) oNLY A FEW REMAIN UNSHOT.