A team has finished a game with 7-3-1 runs-hits-errors line 2 times since 1897, most recently Chicago Cubs on 7 August 1965. That is about one every 221,502 team-games.
Box score for the most recent one ↗
6-22-4 6-24-1 6-28-5 7-1-0 7-1-1 7-2-0 7-3-1 7-3-9 7-3-2 7-3-0 7-4-1 7-4-2 7-4-3
The whole distribution — Runs-Hits-Errors Lines · All 18 shapes