I'm playing in the morning so I'm gonna leave the drivers at home and give these a workout!
matching shafts for your driver and 3W - Page 2
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I find it doesn't really matter unless the grip is designed to be counterweighted; even then it's more subtle than changes to the head weight. I don't really feel a difference in SW from 60g midsize grips vs 50g standard ones, but it will change the measurement by 1 SW lighter per 5g in the grip. Because it's between the hands it doesn't add much to the heft even though it changes the balance point.