The biggest problem with steel based cases is they are not forgiving like brass. Much of the same as nickle coated cases. In a dirty environment something has to give if dirt enters the chamber, will it be the case or the barrel?
32” of drop at 500 yards is pretty impressive. A 75gr boattail at 3500 fps sure would flatten out a PRS competition range, and lighten the rifles a good bit. I’m thinking a progressive twist barrel would extend barrel life for civilian rifles.
Questions that come up are: reloadability, how clean does it burn, barrel life, and if the extreme velocities will cause copper bullets to pencil through animals without expanding.
I think this could make a semi-auto PRS rifle much more capable, and flatten out the ranges. If they are loadable or are produced in a match version. My current load is a 75gr bthp’s from a 24” barreled 223 Wylde at 2920 fps. Haven’t shot it much in the last few years. Just had cataracts removed and am going to dip my toe in the water again. They actually got my vision back to 20/10. 3500 fps from a short barrel is pretty amazing.