This is why I'll just stick to smoke and chalk rounds, and also the projectiles for sale at the reloadableshells.com website, especially since I'm in California. Is there a risk of fire with the smoke rounds? With the projectiles from reloadableshells.com are those used for chalk, flares, smoke, or what? Since they are made out of a hard plastic. Or can you just shoot them as projectiles, and if so would they have to be registered as DD? 
That is a gray area. Generally, the hollow projectiles are for pyro, stars and flare compounds etc. You shoot them up, and it makes some sort of colors in the sky, it's just a flare gun.
You take an empty one, or one filled with dead weight and shoot it horizontally at a target, you've arguably just made your RV85 a DD. The projectiles themselves would not be registerable DD's unless they contained over 1/4oz of explosive in them. Strangely, you put a rubber ball or just a chunk of wooden dowel in a casing over .50 cal, and you've made a non-registerable DD round that makes what your launching it from a DD. However, if you make something like a smoke grenade that instead burns OC or CS, it's "defensive" and "gas or irritant dispersing" and not a DD. Go figure.
![[tinfoil]](http://www.armedpolitesociety.com/Smileys/default/hat-tin-foil-smiley.gif "Tinfoil Hat Smiley")
(I think it may have been done to alleviate prisons and LEA's from having to do extra paperwork on tear gas launchers..)
Also, do know there is SOME disagreement over chalk rounds. My FFL/SOT says "
Chalk rounds? Pfft... they're for practice and are just chalk used for MARKING, so obviously they make an unregistered launcher non-DD." Grog feels since they're practice rounds for ammunition that would make your launcher become a DD, or are practice for the rounds that would be individual DD's themselves, and because they're fired to practice for use in an offensive manner, they are "danger close" for someone with an unregistered launcher.
Me personally, I agree with my FFL/SOT friend that I'd be okay with shooting chalk markers out of an unregistered launcher. I figure the ATF would only make a stink over it if they were looking to get me on something, and that meant I already had their attention for other reasons. Something I never plan to have happen, at least through my own stupidity or actions. Everyone else, just be aware that there's a difference of opinion on chalk markers, and they need to make up their own minds.
Also, of those capsules on Reloadableshells.com, the 26.5mm does not carry enough payload to really do a good job with the colored chalk dust as a practice marker, unless there's a small dispersal charge, with fold out fins, and an inertial firing pin in the tail and a 209 shotgun primer, or similar. Some folks on Grog's board have posted some really tantalizing designs for that, but there's been word boo on how to actually make or mold the plastic parts for it.
Smoke definitely CAN start fires. Probably a LOT easier than tracers would, which I hear could get you the death penalty in CA.
Although I suppose you could figure out a smoke mixture that is even lower temperature. I don't know...
