I love the Stud loader for my 177 22 round mags!
So the 177 is rated for JSB pelltets 10.3gr and under. I've been using Crosman Heavies in it. They don't fit great, but good enough to work. They stick a little, but once flipped over i stab them lightly with a toothpick and they fit into the mag loader. Once in the mag loader they feed flawlessly into the FX mag.
Is Stud see's this, I thought a 3D printed circular device with 22 probes would allow them to release the pellets. If not, using the toothpick method is still a whole helluva lot faster then single loading,