common pellet weigt is 22 grains, same as the roundball have
the old style spitzer bullet weights only 15 grains in 6,3 mm

in german this things were called Spitzkugel = spiky bullet? what do you call them? cat slug/cup slug/ cup pellet?

a 6 cavity mould like for revolver bullets but for this pellet would be nice to have with this gun but I imagine there will be problems because the lead will not flow into such thin hollow base cavitys.

Was not knowing this pellet lube before, just read it in the english airgun article above. if you look for "Napier Power Pellet Lube 25ml Spray Bottle" its also available on amazon but I don't know if its worth the money.