Ive been shooting MFX classics full length with 75 grain inserts and 150 grain heads thru my ACS
its 46# at 28" and Im pulling 30.5
The arrows were shooting staight with no visible propose or wiggle
They just would not group so I decided to bare shaft one and what I get at 10 yard is and almost sideways nock left shaft which I believe is telling me weak spine.
I have some Vapor Hunter 400 full length.
With these shafts with a 150 grain head they are flying much better and I started cutting 1/4" off at a time until they are flying straight.
Now I am getting a hard nock down Is this and indication of a low nock point.
I also plan on shooting 170 grain broad heads so should I also be tuning with 170 grains up front