Shooting 40 Super with Glock 21 Posted May 16, 2014 in Ammunition, Guns & Gear, Pistols by Nicholas C with 7 Comments Ammo Test uses a Glock 21 with Lonewolf 45-40S conversion barrel. He is shooting 40 super. It is a .450 winmag case trimmed down to 10mm length and necked down to 40 cal. Rather impressive velocities. Upwards of 1700 fps.