I,ve used weights poured in muffin tins w/bent to go over head heavy wire loops in strong currents and ice flow infested water and never had them pull. Poured till full is probably more than 12 oz. I only poured 3/4 full for geese. Actually watched the decoys turn fairly large broken ice sheets just hopeing the tanglefree line they were rigged with wouldn,t break. Decoy Line length is the determining factor.