Well I dug into my war chest and found the norna swift cartridges......4110fps@ the muzzle, thats only 90 ft per second slower than what I stated.....just about the head start a Texan needs to keep from gettin his butt kicked from an Arizonian, Pencilneckanian (trky) or an Oreganian in a 100yd foot race.....Better yet, the way I stretched that (4200fps) you would of thought I was from Texas.....