TFOX,

It does not matter how large or small your arrow is, it will drift at the rate the of the air mass. However your smaller diameter arrows with the small fletch will weathervane less in a given period of flight time to the target. The faster the arrow is the less drift you will see before it impacts the target due to shorter time airborne in the air mass.

Steve,

I guess I was addressing the faster setups at the time and not stating it. I do agree that getting down to about 8% or below with fixed broadheads is a bit light. I have shot broadheads there before, the arrowspeed was up around 300fps which probably accounted for the stability. The grouping was there with my fieldpoints to 40yds so if it isn't broken well.....