I went to the pro shop with a little problem today,my 2315 xx78ss with 100 gr.muzzy 3 blades and 4"quik spins vanes werw shooting great out to 25yds anything further and the arrows would be about 3 inches left. He \said he'd fix me right up,he took out the lazer centershot and sure enough it was off!!by about and eighth of an inch!!So he got top dead center on the arrow, came home and my first group at 30 yds crushed 2 arrows, not robin hoods but damn close, so if your pro shop has one and u have similar problems, give it a shot worked for me!!! bow (mathews legacy 29" draw 27 1/2 inch arrows


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