Bare shaft flies great. The ol lady thought i needed fletch and was watching me test in back yard. Stunned i was hitting the bull at 20 yards w bare shaft.
My paper tune obviously done way close ( 6ft - had moved frame off to side to shoot at D ).
Explained how they were going in straight and that bare shaft is done only with field points.
Week later she watched me stick broadheads in center of my block target, fletched arrows of course.
Checked the 3 rivers dynamic spine calculator and was like 4# off. When i adjusted the shaft length to half inch less ( because longer insert..reducing amount of shaft that can flex ), the calculator showed like .5# diff.
I built a heavier spine arrow w reg insert plus 50gr behind, and running a 175 gr tip.....got same diff.
While both arrows are built to proper spec, the 400s are more forgiving than the 340s.
My 400s w 125 hr heads and 100 gr inserts weigh 500gr.
The 340s w 175 gr head and reg insert plus 50gr behind are 535.
Both work fine but the 400s dont stray as much when i get a less than perfect release
Last edited by hookeye; 11/17/22.
