Best Sand for Rifle Rests Bag?

Use Air Soft BBs. They're light, don't take on water, and don't crush either. It will cost a few bucks but it will probably be the best in a long run.
 
I filled mine with 80 grit sand blast sand, but it will take a while to fill, because it has to settle. My rear bag is filled with the sand too.

Some people use polypropylene beads for weight reduction, but I feel, for shooting off the bench, weight is your friend.

same as me Pete type's the truth
 
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