I've never tried it but I've heard that the milk and weed combo's aren't that great. Kinda narstay. And I'm not sure what happens to half and half when you "set and forget" in a crock pot. My suggetion would be to make green dragon or cannabutter and develop some kind of beverage around that if you want to make shots.

If you like the idea of milk based drinks, but you're OK with some alcohol, then maybe put some concentrated Green Dragon tincture in some Creme de Menthe, and use that with milk to make grasshoppers. Green dragon pretty much just disappears into Creme de Menthe wtih no other flavor. And a grasshopper (I think that's what the cocktil is called) made with milk or cream and Creme de Menthe is a pretty tasty drink.

On your other questions. A shot is anywhere from 1 ounce for a small one, to about 1.5 to 2 ounces for a bar shot of liquor.

And .4 grams is a pretty generaous amount per "serving" if you ask me. I depends a lot on the weed, and the person consuming it, and how efficient the recipe is. But my green dragon uses about .15 grams per serving and is plenty strong. Better try it out on yourself first before serving it up to 70 of your closest freinds, or you might end up with a stampede at the ER.