Im very curious as to the actual velocity (not that i think you should keep shooting that ammo in your gun). Quickloads think you should be able to reach that velocity with a 255 lead SWC and long shot within +P pressure limits. Ive shot 230s XTPs out of my stock XD barrel at 1150 and have seen nothing like that. Granted the XD provides full support, and i was running a 28Lb recoil spring.