You can use Nerf darts in Buzz Bee shells, and the only real way to get rid of the shells is to have an internal shell using cpvc. Please see related link below for a writeup on this is featured on NerfHaven.
the magstrike is supposed to take the Velcro darts but it will also work with sonic micro darts ( Vulcan bullets )
Clip system darts
the Nerf stampede uses whistle bullets
some need suction cup darts and some need clip system darts.
The standard orange tipped darts
Micro darts/ sonic micro darts available in packs with an extra belt. Don't put streamline darts in a vulcan.
To shoot the double shot, you have to cock it enough so it clicks and makes an L shape. Then put the darts into the orange shells and put them into the two holes at the corner of the L. Then you can fire two darts at once. then press that button at the top/middle of the gun and bend it. The shells will pop out. To shoot again, repeat the cycle.
You get 60 darts with 3 18 dart extended clips and a 6 darts clip.
Darts
streamline darts
sometimes only with streamline darts and suction darts if this answers wrong is actully right i tried it
The Vulcan can hold 25 bullets in each belt