I'm shooting very tight groups with an '05Mathews Outback, 29" 70#with Gold Tip hunter xt 5575's with tips. I have yet to screw in my muzzy 3 blade 100 grain broadheads and shoot. Should I expect a whole lot of difference with my results? I will try it this weekend. I participate on a number of different forums (boating, fishing, hunting etc) I have found this forum to be the most informative and the most forgiving. I'm a newbie, so please spare the wisecrack comments. As always, thanks for any and all help...