sand versus shot in speaker stands


recently purchased monitors and stand for bedroom and do not know if i should fill stand or not. if the stands should be filled what material should be used. i always read about stands being sand or shot ready, but i must admit i do not know what is meant by shot and where one goes to by shot.

thanks in advance for the help
bianchi27
Remember, lead is hazardous. Do not, under any circumstances, eat, lick or kiss speaker stands that have been filled with lead. Regardless of how sexy the speakers on them are sounding this is hazardous to your health.

Better than lead, the suggestion above of using uranium "resonated" with me. Depleted uranium is a by-product of the military complexes activities, but the caliber munitions they use are too large for filling stands.

Does anyone have a source for depleted uranium #9 bird shot?
A bit off topic- Nordost packaging usually states "LEAD FREE - Save our environment" on a green sticker featuring a pine tree. Didn't expect the brand to be an environmental activist.
Some years ago I read an article/review in an audio journal, which claimed (on the basis of mesurements) that iron/steel filings are the best filling for speakers stands. I beleived them and filled my stands with them.