Almost nothing would happen to the sun as a result of shooting iron at it.  The total weight of all the iron in the Earth's crust is approximately 1.385×10^21 kg.  Disregarding the effect it would have on the earth to remove all the iron and the energy required to send it into the sun, it would have little to no effect on the sun once it arrived.


The sun is currently about 0.1% Iron, which means there are currently aproximately 1.988×10^27 kg of iron in the sun or about 1.4 million times as much iron as all the iron in the earth's crust.  As a result, in order to meaningfully affect the fusion processes in the sun, you'd have to use vastly more iron than is in all of the earth's crust.
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