Flare Launcher Chalk rounds a DD?

I believe it depends on what caliber/diameter the launcher is.
37mm flare guns aren't DD's, but 40mm flare guns are (because you can get 40mm grenades.) - - going purely from memory there.

Doesn't over .50 cal the definition of a DD?

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For a rifle yes.

26 U.S.C. 5845 (f) (2)
(firearm with a bore of more than one-half inch in diameter)

37/38mm gas/flare guns possessed with cartridges containing wood pellets, rubber pellets or balls, or bean bags are classified as destructive devices for purposes of gun control act 18 U.S.C. Chapter 44

Chalk would be considered a marking or training round not anti-personnel. As long as you don't have anti-personnel munitions for your weapon you are good to go

crazy-mp said:

Chalk would be considered a marking or training round not anti-personnel. As long as you don't have anti-personnel munitions for your weapon you are good to go

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Correct. You can buy the training rounds for the M203 or M79 without a bunch of additional paperwork. The same should be true for 37mm.

The 37mm launchers are not even considered 'firearms' since they do not chamber any commercially produced 'anti-personnel' munitions. "Rolling your own" opens you up to possible prosecution.

I looked into this. Wanted an NFA DD, shot the M79 in the army, guy brought one out to the range for giggles. Lots of fun. To be honest, unless you've got something to blow up, the chalk rounds are more fun at the range. They make a bigger "puff" (but no boom). Was told the chalk markers were not DD's, but they ain't cheap either.

The chalk or smoke rounds are just a little cheaper too

found a site on reloading components for big bores you can probably size down the info to your caliber: http://www.okiebigbores.com/37projoinst.htm http://www.okiebigbores.com/37mm.htm I've never done it but it looks pretty interesting.