It's not that the following pellets are pushing, but the leading ones are being slowed by aero drag. Guess it's all relative, Einstein.
Here's an actual experiment they could do on that stupid space station instead of just going around in ellipses.
We could prove or disprove the 'vector' theory of choke effect.
Just have them take a double shotgun up there choked cylinder and full.
Roll down the window and blast at a pattern board.
The cylinder choked load will make one bore diameter hole, and the full one? I think it would do much the same thing because aero effects predominate, certainly the hole won't be very big. Don thinks otherwise.
Of course, the recoil will louse up their heretofore perfectly trimmed orbit, and they better get that window rolled up pretty quick lest all the vacuum rush in.