100 going to 125 grain heads won't change your setup or speed that much but what it does change is your FOC on your arrow. You'll notice more accuracy at longer range shots with it say over and out past 30 yards but you might have to change the pins on your sight to accommodate the POI out past 30 yards. At 20 yard shots you won't notice any difference other than more pentration or maybe 2" more of dirt on your arrow when you pull it out after passing through your deer. LOL
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