My first wildcat: 6mm-223

[Lone Star]

Great results out of the 6mm/.223. I had similar issues with that Sierra 85 HPBT bullet and stopped using it on game decades ago.

Actually, you would see no practical difference in accuracy with a 6PPC over the 6/.223 in a standard rifle. The only time the PPC shines in equally-built rifles is in BR competition, with heavy, purpose-built bench guns. There is no accuracy advantage in a hunting rifle, and in fact there isn't much in a BR rifle; it's just that an extra 0.05" smaller group makes all the difference in that sport.