Not very darn many! Great snag, Chris!
Of all that I owned (current one an M1I- M1 arsenal upgraded to M2, with Roman numeral "I" added to the M1 stamped on receiver ring), none ever shot splendidly with high vel ammo. 1"+ groups at 50 yards- certainly decent hunting accuracy, but paled in comparison to the roughly 1/2" accuracy I came to expect with std vel match ammo.
The arsenal d/t'ed many for target scope blocks, for a fee of a buck or two, plus it was a common aftermarket mod. If you find one like that, hang an old Unertl or Fecker on it and see what those old girls will really do. Mine will drop into the 1/4" neighborhood on occasion when outfitted thusly. Not bad for a 90 year old Army .22!
