We’re basically back to nukereal shatter from a bit over a month ago.
https://warthunder.com/en/tournament/replay/150403191997229636
B18B tail in 1 Type 99 Mk2 shell.
P-47D tail with single shell.
Bf 109 G6 wing with a single shell.
Yes, some parts of planes feel very durable, like T18B or B-17 wings, but fighter wings and tails in general are no match for single 20mm, even HEF-T with 8g TNT equivalent. Which is bollocks of course.
After travelling for 500m IT starts overtaking M-geschoss.
At higher alt, it happens a bit later.
Genrally from behind this means when you and enemy are travelling normal combat speeds, anything above 350m will have IT striking bit earlier. The difference gets much bigger past 400m.
Remember, when flying at 120m/s at sea level the shell is fired at 120m/s higher speed and lighter M-geschoss will bleed that additional speed even faster.
But generally at v. short range M-geschoss arrives first, at longer range IT has the advantage, at most common 250-450m again, depending on the angle and alt) there is v. little difference, luckily and since even IT has dogpoop ballistics, shots at higher distances are mostly fired vs targets that are either higher alt or stalling or v. big.
But overal - landing good shots with MG151/20 is a bit more tricky.