Some good posts above that are partially correct, tho they did not take it to the next step in their individual tuning process. Here is the deal....
Broadhead tipped arrows should hit the exact same spot as field tips if tuned correctly. It can be done, and is done if one takes the time to do it.
First, you must tune your field points till they are grouping excellently. You can't skip this part and expect everything to flow smoothly, it will take you much longer in the overall process. Tuning takes TIME, and patience. Put some time aside for it without interruption.
After shooting the field tips and finding a good tight group, shoot a group with broadheads close to the same weight, making sure you KNOW you shot a good group, and also before you do that the broadhead is spinning true on the shaft, sometimes shots will "plane-out" due to the fact that the broadhead was not properly installed. Only takes a slight wobble with fixed-blades to throw them out, mechanicals of course will be a little more forgiving in this respect, but have their own inherent problems which is another story.<img src=icon_smile_wink.gif border=0 align=middle> See where the impact points of the broadhead-tipped arrows were in relation to the fieldpoints. Most of you guys are saying "left" in this thread, which indictates stiffness on the broadhead-tipped arrows part. Give the limbs a crank to add a pound or two and help break spine, or throw on a slightly heavier broadhead,(I know, it's another $20, but it's worth it) then shoot another group of each of the field tipped arrows, and the broadhead-tipped arrows. Check their relationship, and continue the tuning process of SMALL adjustments (weight, nocking point, centershot) until you get both flying the same. Once finished this will mean your bow and equipment has been properly tuned for all applications, and both will hit the same spot every time.
All broadheads are not the same, they are not parabolic like a field tip, and like IMN3D stated above, will not fly exactly the same simply by weight.(even mechanicals) Sometimes it takes a little time, patience, and experimentation with different heads to get things tuned correctly, but knowing that the bow is tuned to the finest degree is worth the effort, and will give you the utmost confidence when you are ready to step into the stand. Good shooting, Pinwheel 12
Edited by - Pinwheel 12 on 11/10/2002 05:47:37