Hoy,
What is your desired effect of beadblasting?
Garnet will remove a lot of material in a hurry.
AL/OX Aluminum Oxide. ?
Glass bead ?
Plastic bead will not dimensonally change the base metal, but will remove surface coatings.
We also use water with our grit (vs air) for a fine finish; AKA HydroHoning.
The coarseness of the grit will also determine removal potential and time.
If you want a small amount of grit to try, PM me.
The Kid