Hello all
Recently I have come up with a load giving me good accuracy.... 3/8-1/2 MOA out of my Cooper arms .280 AI excalibur. The barrel is 24 inches. Nosler advertises MAX 62.5 grains of H4831 giving 3179 FPS and Hodgdon shows MAX 62.0 grains of H4831 at 3012 FPS. My currently load is 62.1 grains of H4831, Nosler brass and F210 primers. My last range session I chronograph my load at a disappointing 2840 FPS........ not even close to 3000 FPS. Has anybody had a similar experience with H4831? I chose H4831 for temperature stability, however I am considering RL 22 for the extra speed. Any thoughts??
Thanks
Recently I have come up with a load giving me good accuracy.... 3/8-1/2 MOA out of my Cooper arms .280 AI excalibur. The barrel is 24 inches. Nosler advertises MAX 62.5 grains of H4831 giving 3179 FPS and Hodgdon shows MAX 62.0 grains of H4831 at 3012 FPS. My currently load is 62.1 grains of H4831, Nosler brass and F210 primers. My last range session I chronograph my load at a disappointing 2840 FPS........ not even close to 3000 FPS. Has anybody had a similar experience with H4831? I chose H4831 for temperature stability, however I am considering RL 22 for the extra speed. Any thoughts??
Thanks