Using CCI Blazer Brass, 158 grain JHP factory loads, my .357 magnum rifle grouped 3 shots in 1 7/8 inches, 5 shots in 2 3/4 inches. All at 100 yards, rested on sandbag.
I am trying to duplicate that factory load accuracy using Speer JFP bullets over 15 grains of H110, CCI 500 primers, in...