You could do it, but the mineral cost involved, as well as the factory time diverted from constructing missiles that could actually inflict harm, would almost certainly make it more efficient to use only damage dealing missiles. If your enemies are capable of swatting far too many of your missiles out of the sky, then you may be better off using more missiles of a smaller size. This would require you sacrificing either range, or warhead size per missile, but will let you direct heavier salvos at your enemies.