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You need to check the rules for whatever discipline you plan on shooting in (USBR, ARA, IR50/50, etc.). Some have rules that prohibit the use of anything "metallic" to fill the bags, which would rule out lead shot, which some folks use for the added weight. Mine personally are filled with tiny glass spheres (bead-blasting media). I like it because it flows well, is fairly heavy, and doesn't "pack" at all.