OK- any help appreciated...
I have just plugged in expandable broadheads (steelhead 100s) and am getting consistent but different impact points when compared to my field points.
My setup:
70 lb bow, TT dropaway rest. Loop and release.
28" acc 3-60s going 267fps.
Three 3" vanes, 2 degree offset right.
100gr field point/bhead. Total arrow weight ~405 gr.
I have been shooting many years, and was just thinking that I was shooting as well as I ever have, getting 2" groups at 20, ~4" at 35 and ~6" at 50.
Pins at all nicely lined up and spaced as you would expect them to be on a well tuned bow.
Pro shop paper tested today, perfect bullet holes.
Now the problem(s):
First, I noticed a whistle downrange with the broadheads. This was solved by double-banding the blades.
The problem I have been unable to fix is the point of impact:
20 yds is dead on.
35 yards is ~3-4 inches lower than the point of impact for field points.
50 yards is ~4-6 inches lower, but more surprisingly is also ~6-7" LEFT.
The groups are pretty good, but those spots are not. Heck, my sight won' t even allow for one pin to be set out to the side of the others.
Steelheads are tiny. Their blades do have an offset (right) to them...but everything I am hearing is that they should group right where the field points are hitting.
Again...help!