At 400m, any subsonic bullet is going to require not just perfect conditions but certainty on range and wind as well since you can miss an entire large mammal with a minor ranging error. Just spitballing; but at that distance something like a 12.5 yard ranging error will cause you to miss your target by about 1.5 feet.
The farthest I’ve shot subsonics was out to 250yds on a range and they already had a noticeable arc on them at that point.
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