we have the old LP steels at 2250 then a 10%+ overfill. These are the old LP72's primarily, not made anymore. Overfill can be removed at hydro if the tank is showing signs of stress hardening
newer LP Steels, 2400 then 2640 with the overfill, same overfill + rules as above.
Most aluminum tanks at 3000psi
Mid-Pressure Steels at 3180/3190-Faber and Heiser made these, super negative, not made anymore
High pressure AL tanks at 3300psi- Catalina makes a C60, C80, and C100, and Luxfer makes a 100, about it. Don't see these often
Modern "HP" Steels at 3442-Faber is only current one, Worthington and PST formerly made these. This was done to facilitate the sale of the 200 bar convertible valves as it circumvented the DoT law for tanks over 3450 to have 300 bar DIN valves, no yokes.
True HP steels at 3500, not made anymore, only by PST, and had the "skinny neck" and funky valves.
No true 300 bar tanks sold here
The debate is typically only done between the LP and HP tanks at 2400+/2640 and 3442. Very rare to see the 3300psi aluminum tanks, never personally seen a mid pressure 3180psi tank, but I do own a few 2250 tanks and 3500psi tanks.