Checking Ten Point website here is some information for the 20" arrow:
445 grain for the 20". Divide 445 by 20= 22.25 grain per inch.
Note: it did not mention having a point installed or lighted nock.
FOC 15.% ID .297 OD .344. Insert weight 92 grain brass.
3" Bohning X vanes.
Wishing you all the best.
Take care.

 

I have to believe the 445 includes a 100 gr. Point.

 

Finished arrow is 17.25 when you take out the 100 grain tip.

 

I thought GPI is bare shaft?

 

it is unless you say finshed arrow, then it is with all the stuff on it minus the tip, which I called out.

 

Thanks to all for the info.