When you destroy a property of an item, is it total or partial?
ie if you destroy the "weight" of metal armour, must the armour be weightless, or could it have 1/10th its normal weight ?
IMO, you'd be better off going with a Muto "change a property" guideline to make lighter armor. Perdo seems more likely to be "all or nothing" in my mind.
Your saga (and other interpretations) may vary.
Spells don't have to be efficient. If you want to destroy only part of an item's weight there's nothing keeping you from doing it other than custom at your table.
Rich
That is your answer. Target Part.
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