September 03, 2011 at 8:45am
Need more information and Inferno4me could definitely answer this issue. Information: arrow length,spline number and brand, bow draw weight and IBO and what type fetches is he shooting (2 inch or 4 inch).
If he was on target with target tips and off with the broadheads it would be an issue with tuning the broadheads to the fletches. The only thing that comes to mind is FOC and are the field tips the same weight as the broadheads? FOC is dealing with the arrow balance and refers to Forward Of Center. Optimally you want your arrow to be between 7 to 15% heavier on the front 7% forward balance point of center to 15% forward balance of center. If an arrow is balanced at center it will be a floater which would account for the inaccuracy. The braodheads working with the vanes could control the imbalance through stearing the arrow, where as with the target tips they have no stearing ability. 4 inch vanes control an arrows flight better than a 2 inch vane. Everyone uses 2 inch vanes to gain speed but, guess what....2 inch vanes only give you 2 feet per second but cost you arrow stability in flight.
It maybe he's shooting his old arrows on the new bow and the new bow is stronger than the old bow. He might need new arrows with a stiffer spline. The bow may be out of tune. A lot of bow shops put the bows together and don't tune them!
I'll put a call into Inforno4me and have him address your post! Good luck!