For those who are interested in making sabots or multi-darts, I happened to notice that Chapstick caps work well with 0.625 blowguns. They fit snugly and propel cone-less darts rather efficiently. Anyone else have any ideas regarding sabot systems?
Here's some threads dealing with sabots for .625 cal as well as other calibers...
This shows several different kinds of sabots. One that's very easy to make if you've already got Cold Steel blowgun and darts is to fasten a couple of the orange cones together, as shown in the thread. In fact, Cold Steel apparently liked the idea so much they adopted it for use in their "Multi Dart". A sabot can also be as simple as a cone rolled from paper or film.
http://blowgun.lefora.com/2009/11/07/neat-new-blowgun-prototype/ This thread shows/describes using the sabot to launch steel pellets.
The last link shows sabots made by cutting down plastic shotgun wads. Out of the various brands I've tried so far, I like Remington the best overall. A 20 gauge wad will fit a .625 caliber barrel, but it will be a bit loose. I would not recommend using the shotgun wad sabots with Cold Steel's mouthpiece--there is a danger the sabot could get sucked out backwards if you accidentally inhale at the wrong time. If you install a crossbar safety, the sabots can be muzzle loaded.
I will have to try the Chapstick cap idea...