The 'standard', i.e. the best, is and has been for 30 years now the STS, at least in 12 and 20.
One piece brass head, long life easy to reload hull with hard shot and clean burning components.
The reloading excellence of the product is of less importance in today's world of insane prices for components, but it's still the best shell on the market and the race isn't close.
That said, I now shoot mostly cheaper stuff for most applications having accumulated a lifetime supply of STS hulls for my older guns which now see less use due to changing shooting interest and venues.
Competing with $84.90/flat Rios delivered from Natchez for $5 flat rate as much as you want would seem to be a difficult business proposition.
Would I shoot that stuff at The Grand American Handicap? Certainly not, but that's in my rear view mirror.
Top Gun, Shooting Dynamics, Rio, Stars and Stripes, Gun Club, Nobel... they all shoot well enough for most of my uses and I burn several dozen flats a year without having to chase lead and powder or pull the handle.
We loaded shells for 11 cents each for near 25 years. That's long gone.
The economics are both a mystery and ever changing but an American loaded shell in a eurohull would seem pointless at this time.
