Regarding the filler:

When you guys mention talcum, do you really mean talc?

A lot of guys reach for common baby powder which is really just cornstarch that's why it feels so light.

I did a search and found this on talc vs cornstarch:

http://webcache.googleusercontent.co...&ct=clnk&gl=us

This describes many properties of each compared including strength and weight. The materials involved are slightly different than what we're using here but I think the principles still apply.

I hadn't realized talc was being debated for long term exposure health issues but it might be worth considering.