Shake

Hi All;

I seem to be finding contradicting informtion from numerous sources on ball milling star compositions as to whether it is safe or not.

Is it based on particular comps that are more sensitive to shock?

In reviewing the some comps such as Tiger Tail and Willow stars I don't see much of an issue, but then ones like D1 Glitter with Al and KNO3 I wasn't sure.

Can anyone help clarify?

HI there;

I've search quite a bit for this with little success...

Is there an equation to figure out how much lift powder to use depending on the size and weight of the shell including the length of the mortar and the relative length of the time fuse?

Trial and error seems a little expensive and time consuming and being about to assemble my first shell this weekend I want to make sure (as close as possible) that the shell gets up high enough and breaks at the right time.

I'm working with a 3" plastic spherical shell (actually 2 7/8") and a cardboard mortar of 3 1/8" ID by 22" long. The shell will have cut stars 9mm X 9mm X 5mm, powdered Rice Krispies and a flash powder break charge.

Any suggestions would be helpful.

Thanks!

Chris