shell , missile acceleration rate

why artillery shells and bullet can accelerate so much faster than missile? they dont really have much more fuel , powder

Sprint missile have much higher acceleration rate compared to other SAM today , at 100 G

HIBEX missile have the highest acceleration rate of all missiles ever at 400 G

ICBM missiles and spacecraft can accelerate at 3G

whereas
artillery shell can accelerate at 15 500 G

9 × 19 Parabellum handgun bullet can accelerate at 190,000 G

http://en.wikipedia.org/wiki/Orders_of_magnitude_%28acceleration%29

bullet and shell are not anymore aerodynamic than missiles so what is the reason ?
also Pilobolus fungi can accelerate spores at 20,000 Gs
https://www.youtube.com/watch?v=TrKJAojmB1Y