>>64120589
You can do all of the things in a very small package, that is still accurate enough to engage targets at realistic ranges. 9mm has terrible dispersion, external and terminal ballistics are bad. 110 supers destroy shit, expanding subsonics for low vis shit. AP an option.

The compromise is the use of supersonic bullets. .300whisper was designed for subsonic loadings, 338ARC optimizes for that at the expense of supersonic memes. 8.6 is just a product improved version + lessons learned.