I've been told that using CCI BR primers makes a big difference - I am just starting to reload and will be loading for .223 long range - the recipe I was given was Hornady 75 gr A Max, around 24 GR Varget (which is within the specs in the Lyman manual) with a CCI BR primer. This is for a Savage 12fvss, 26" barrel, 1 in 9 twist.
On same topic, anyone have a reduced load for .223 - looking for something for the indoor range, 50 yards. Just needs to stay level for 50 yds.