350 Legend does nothing for me.......
If you are a reloader a re-barrel to 6x45 may make sense at some level.
I suggested a 6mm cartridge that uses the Legend case. It supposedly holds 35 grains of water which is 5 more than the .223 Rem.
Velocities claimed from BC Precision web page.
58g v-max 3528fps
85g Speer BTSP 3015fps
90g eldx 2826fps
You were Pretending aloud,with your GoogleFu. Hint.
The ARC's case capacity is 34-ish grains,depending upon brass Manufacturer. It's case length do GREAT favors,in conjunction with the capacity increase and the OEM RPM. Hint.
As plainly cited,pass the ARC and hold The Fluff. Hint.
Fhuqking LAUGHING!....................