Hi all,
First, I want to thank for all the replies and responses I got for my previous questions.

I have arrows of 2 types: Type A has field point and straight 4" vanes. Type B is slightly lighter (by 20gr), has fixed broadhead and RH helical 3" vanes. Same shafts.

The problem: At 20 yards, type A hits 7" left and above type B.

Vertical variation I can understand, but why is the HORIZONAL variation?