When I go to the "ballistic" app, and select for "best flatness" for the 223 and the 6.5 Grendel, I get the 55 grain Hornady VMAX Superperformance and the 100 grain Wolf FMJ-BT.

Trajectory seems to be similar out to 600 yards, but the Grendel has 818ft-lbs energy at 600 while the 223 has just 306 ft-lbs.

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