Info[]
Will be calcing the feat done from chp 34 where the angel devil blocks two bullets with his wings
The wings are seen to be tucked in like this right before the feat
The distance seems a little weird just due to the perspective
Calc[]
Will be using just a dimater of the rim at 9.8 millimeters since that seems the average

3 px | 0.98 cm
Panel height 492px
Convert to meters
(0.0098 * 492)/[3 * 2 * tan (70deg / 2)]) = 1.14765973822 meters
Second panel

So the author of the chainsawman manga said makima is confirmed 173cm so Aki should also be that
Using this website, we get a head height of 23.1cm
Aki's head 48px | 23.1cm
Now since the wings are usually tucked really small behind angels devils head I'll try to find their distance
Angel wing = 668px | 321.475cm (this seems really big, but the wings in other scenes really show that the wings are massive)
321.475cm (3.21 m)
I will assume that the wings started to move right when the bullet fired
it seem to be just 9mm, since it is pretty close range I don't feel the need to calculate the bullet slowing down
(3.21) x (365.76) / (1.14765973822 )
S = 1023.02935 (Supersonic+)