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Any of the bags I've seen will be very heavy to carry around if filled with lead, reclaimed or otherwise. Other options at mentioned above from clean dry sand and rice are far better.
Another possible source of filler is aquarium gravel. This stuff tends to be larger than coarse sand so it doesn't get into the stitching as easily and end up cutting through it like sand might do. And it's a touch less dense and thus lighter than sand. But it's heavier than rice or other such options. It's not overly expensive either. It would be my choice for a shooter's bag if I were filling one.