One needs to define intrinsically accurate".
IMO opinion the cartridge that is easiest to make shoot well is the 222 Rem. It was developed by Mike Walker a Remington engineer/benchrest shooter specifically for shooting small groups. It turned out that not only was it capable of shooting small groups but it does so with a great many powder/bullet combinations.
While it may be argued the 6 PPC is an "inherently accurate" cartridge on examination this does not hold true since its best accuracy comes only within a narrow range of velocity, bullet weights and powders which IMO opinion removes it from the "inherently accurate" list.
drover
