I bought a Cabine Tree grease wad extruder years ago. Heavy, well-built, and will probably last several lifetimes, especially if one gets the amount of use mine has seen. I used extruded wads made from LBT Soft lube and had some limited success with heavy plainbase bullets in .357 Magnum. Accuracy was noticeably improved, but making and fitting the wads was more trouble than I cared to deal with.
I tried wads in one or two straight wall rifle cartridges with no accuracy improvements noted. Again, all my work was very limited at the time so I don't feel qualified to make a general judgement on the usefulness of extruded wads without extensive work. Anyone here use extruded wads? I asked this question some years ago on another website and most who responded preferred to talk about fillers, probably because that's what they were familiar with.