Considering that 3rd Kazekage was the most powerful Kazekage in Sunas history, he could use Iron sand in the same quantity as Gaara and 4th Kazekage could use their version of sand ->
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Amd Sasori has all this power, thats how human puppets works.
What people seems to forget is that Sasori was simply playing with Sakura and Chiyo when he was using 3rd Kazekage puppet. He only decided to use "a litte more bit chakra" as he said so when he used Satetsu Kaihou.