Not sure if it is cost effective vs any bulk sources but one option to consider is scuba diving weights: https://www.amazon.com/XS-Scuba-Lead-Shot-Weight/dp/B0020L0GKQ?th=1&psc=1
If was going to do lead i'd do half lead and half sand just to not make it top heavy. I have a 90 pound fury monster running around here though so you might not have that safety concern.
I'll probably do both sand and shot, mixed, just to maximize mass-loading. They're short stands to raise them 15cm above my desk, so the heavier the better. I guess I'll ask at the local weapons place, everyone tells me they are extremely unpleasant people ...
@Poleepkwa didn't know about those. Looks good, price is fine, and I don't have to leave the house. Win-win-win!
I would go with sand all the way. It's not just mass loading, the sand dissipates energy better by allowing micro-vibration from the grains. I would at least just try sand first and then go with lead if you have to.
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