Lead Sled or not, it's up to you. I understand that you are trying to minimize the variables. My preference, for me, is a good front rest and rear bag from the bench. For the FB loads I would do .2 grain increments, three shots each on a calm day. I would not change anything other than the charge. Once you have settled on a particular charge, then tinker with seating depth. Only change ONE thing at a time. That way there is no confusion as to what caused the group to change. Neat that she goes to a school that is open to such a project!
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