My results using H322 with 123 gn Noslers. With a 20 inch barrel and using Hodgdons max load of 26.6 gns I had a muzzle velocity of 2433 FPS. GRT predicted 2511 FPS. The following thread details the real life performance at 850 yards at 7 - 10 MPH winds a 20 shot group measured 10 inches in height and 16 inches horizontal.
https://www.65grendel.com/forum/showthre...ice-target
https://www.65grendel.com/forum/showthre...ice-target

