| I am assuming you are right handed - if you are shooting off the hand get your brace height and your bow hand and nocking position correct first as you need to be as consistent as possible. Without a shelf your arrows will need to bend around the handle on release - too stiff they don't bend enough so will group left, too soft they will group right. Usually I find bows that are shot off the hand prefer arrows that are spined below the bow weight but then again it depends on your draw length, length of shaft and weight of the point. A heavier point has the effect of lowering spine so try playing with different point weights. Also adjustments to brace height can affect where your arrows are grouping - a lower BH will make your shafts behave stiffer. If you really do not know what spine shafts you are getting and have no access to a spine tester you can try tuning the arrows to the bow. Quite often even in a 45-50 lb batch of arrows there is always one that is too stiff, sometimes 10+ lbs over. Rather than not use it I chuck the shaft into an electric drill, and spin the shaft through some 120 grit sandpaper held in my left hand. Wear a glove as it gets hot and wear a mask as cedar dust is not nice. Finish off with a finer grade. Using this method I can get all of my shafts down to virtually the same spine. The stiffer arrows you can leave longer, if they are too soft then cut them shorter and use lighter points
Tuning can get very complex as so many variables are involved - just be methodical. Make small changes, one at a time, before trying something else. Good luck. |