I think all of the reloads are using composite fuel because black power is too brittle for reloads (but there may be a BP reload that I'm not aware of).

The composite motors are all more aggressive than the black powder motors in the same size. They don't seem to be much cheaper than black powder though unfortunately... unless you do a lot of launches.

I've sort of ended up in the middle ground of rockety... large model rockets... D - G. Check out www.the-launch-pad.com

I was into High Powered Rocketry for awhile but WAAAAY to expensive. $25-$100 per launch. Ouch!

Rocketry! LOL

You could always roll your own Sugar Motor (basically black powder) reloads as long as you keep them sealed (sugar motors are hygroscopic).

-Real men love rockets-