I agree wholeheartedly with Len. Ive seen to many articles from other well know tuners, or deer hunters who state that b.hds. can and should group with fpts.If your not right on the edge of being under or over spined the extra b.hd. length doesnt matter. F.o.c. s will be slightly different but will only change impacts at longer distances on a vertical plane.If you want to experiment, the next time you built some arrows leave one about two inches longer and see where it groups in relationship to the others. If youve done your homework, and matched your arrows to your bow,or your bow to your arrows, bareshafted for spine and got bare and fletched impacting together, the longer shaft will indeed impact with the shorter ones. There may be slight up and down scattering because of weight at the longer distances but side to side will be the same.