I understand your frustration. My frustration the last time we went thru this resulted in me shooting mostly factory ammo. I was easier to shoot factory than to shop for wads, and shot, and powder, and primers.
Do you remember where you saw the Winchestwe 572 by chance THXI have switched over to Longshot as it is available. Winchester 572 can be found now too. Unique and Universal are just not around anymore it seems.
expand your horizon, if you're a reloader, make something else work.At wits end trying to find Unique or Universal. about to give up reloading. In Philly Area . Shydas has something in the lines of Promo but doesnt help me. Any ideas ?
CAC had 20/28 in 8 pounders available several times last year.Have you checked with CAC Associates in Ebensburg?
Longshot is my go to for 20 ga 7/8 oz and 28 ga 3/4 oz target loads. Denser than many others resulting in excellent stack height,There's data using WSF,572 and Herco. For 20 gauge 1200fps target type loads.(7/8) If you want 3/4 ounce. Add Green Dot to the list. If higher velocity is needed add Long shot to the list. I didn't list .20/28. Because it's unobtainable.