I see you have no replies to this one, so I will give you what I've got. I do not shoot 223 in my encore, but do in various other rifles. I shoot 23 grains of Benchmark with 63 and 69 grain Sr bullets with CCI Br primers in Winchester cases. I also shoot Benchmark in my 7-08 encore with light bullets. Shoots real well in the 223 and OK in the 7-08. I have a Tikka T3 7-08 that Benchmark will keep 3 shots touching at 100 yards. It measures consistently out of my RCBS powder measurer.