I shot 100 gn Guillotines the other day out of my crossbow. They shoot 12" left at 20 yrds. There was some wind... no it was windy , but my 90 gn Muzzy's were bulls eye. Junk that! In April its windy almost everyday. I might try some Magnus Bullheads , but I wasted money on the Guillotines. I also thought about the NAP Killzone.