This is a test made in the editor based on practical experience.
For pic1, the left Bf 110 is shot by Springfield M1903 for 1 round, while the right Bf 110 is shot by M2HB mounted on M13 MGMC for 1 round;
For pic2, the left Bf 110 is shot by M1917 Enfield for 1 round, while the right Bf 110 is shot by M2HB mounted on M13 MGMC for 2 rounds;
For pic3, the A-20 i’m driving got its left engine shot by Springfield M1903 for 1 round, while the right engine is shot by M2HB mounted on M13 MGMC for 1 round.
The problem is mentioned in the topic, and “practical experience” mentioned earlier is, there were many times when M13 was used to strafe enemy planes for more than ten seconds, but the enemy only emitted smoke.