wonder if you fellas can help me out ? I would like to load for 6'' GP-100 for grounghogs....I feel the 125gr XTP is a great choice along with 2400 powder....I have a target velocity in mind....can someone give me the powder charge of 2400 with a 125gr XTP to hits velocitys in the 1350-1450 range......Thx in advance....Keith