I am just a reloader, weekender, not a competitive shooter, so my choice was to supplement my Rock Chucker with the green progressive (Piggyback II). It has had its ups and downs. Mostly it has been very favorable. I can put enough 45 Colt, 45 ACP, 357 Mag, and 380 Auto together in a weekend to last a month of shooting. I have made .223 rounds on it too and that has been a dramatic improvement in my output for that little spray and pray gun, which is a ton of fun and very accurate too. I like cheap ammo, range brass, fire formed, reloaded without fuss, that the little guns eats up and spits out to point of aim.
I was loading for a new-to-me used Handi-rifle that is very accurate with the progressive loads I made the last time (~2,000 of them then). It just refused this past Friday. I was using a new-to-me CCI primer #41, specifically made for the 5.56mm NATO. Apparently, the trouble is the .223 cases don't like that primer. Twenty percent (20%) of the rounds I fired today, that is 15 out of 75 rounds, failed to fire. I have another 250 rounds of it that I struggled to make, which are now suspect. Even double striking the primers failed to set them off. The load was eratic and inaccurate, the same load that was very good last time.
I suspect it is all a function of the primers...the only component that I changed in all of this.