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The .223 bullet is likely staying supersonic across the velocity spread at typical shooting ranges, a subsonic 22LR does not pass through the supersonic transistion zone and neither does the supersonic, at most ranges, .223/5.56 bullet. But a high velocity 22LR round transitions anywhere as close as 50 yards, more or less, and spends a lot of it's flight time in the transition velocity range. Subsonic 22LR ammo is often, therefore, inherently more accurate than the high velocity stuff at ranges beyond where the HV stuff transitions to subsonic.
3C
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