The aging one is fine as it is just scaling to the bullet's speed.
pochita just scales to aging.
For the Pochita one if i remember the bullet went through a building before that but it being a perception feat is kinda smelly.
i assumed the feat as a possibly supportive one that maybe could be massively hypersonic dependant of the assumptions, not as a main one for the characters scaling
aging devil perceptions scaling to the bullet speed could be argued because of he being a primal devil much stronger to yoru, but his only speed comparison to her gun goddess is using time stop on the bullet and yoru and not just using his own reaction or combat speed to be massively faster or as fast as the bullet, plus how in
Chapter 187 and
189, against Pochita and the others, he get sliced by Pochita, Tentacle devil swallows him, the aging devil victim grabs him, he gets to directly touch pochita to turn him into a tree while he is still midway regeneration, to then pochita slice aging devil again after Denji ates more flesh for his regeneration
in projectile feats, if a character dodges a bullet going at 377 m/s, when its 5 meters away from them, they scale to a 1/5 of the bullets speed, not the whole bullet speed itself, such big bullet like that gun goddess one can clearly be seen from further than 1 meter (if you have the reaction speed to see it at relativistic speed) so reacting to it from a further than 1 meter already makes the feat having the character be slower than the projectile, regardless if it seems that they could had reacted from a shorter distance too
also for what it seems, that destroyed building that you mention, it could have been a building in USA (
Chapter 178):
first, theres the page im showing below, then theres the page i shown earlier where at the last panel Pochita ´´reacst to the bullet
In Page 1, first Yoru says ´´Bang´´, then the bullets its crosing the water, then theres that building that you mentioned
in Page 2, panel 1 shows the bullet in a unknown scenario, in panel 2 its crossing water, then in panel 3 its about to hit pochita
of what i think its happening, the second panel of page 1 its the bullet crossing crossing the short water around the statue of liberty, the third panel its hitting a building in USA or whatever country thats inbetween of USA and Japan (which its too far to pochita hearing it), in page 2, the first 2 panels its the bullet crossing international oceans, and suddenly in panel 3 is meters away to hit pochita, therefore already reaching tokyo
even if he reacted from the bullet hitting buildings nearby, those building would be hundred of meters away, at relativistic speeds, hundreds of meters are just microseconds of timeframe, whichs its massively hypersonic reactions
This feat calcing is a bit of a headche tho so i may not do it because of this problem
EDIT: also if you say that aging devil scales to the Bullet speed, and pochita scales to aging devil (the later chainscaling being more reliable because of chapter 187 and 189 fight) then so pochita scales to the bullet speeds, which clearly its not the case because he couldnt do anything about it (even worse if pochita started reacting when the bullet was far away), Aging Devil could stoppeed time for it, the stopping time not being a speed feat as fast as directly dodging it o reacting from a short distance (which none of them could or did)