Just depends on what you use, and want.
223 - 77gr SMK or a 75gr Vmax in the 6mm. Both using hodgdy launch speed, and 500 yard max. 900 ele. 59 deg, with 30% RH and 10 mph side wind.
223
Drop - 3.5 mils
Drift - 1.5 mils
6mm
Drop - 3.5 mils
Drift - 1.7 mils
The increased diameter of the 6mm means you need to go much heavier in order to get the length needed for a similar BC. Speeds are a push given the same parent cartridge.
The practical difference is that the splash with the 6mm will be easier to see.
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