Arrow wt

[archerger]

Jim I have at last bought Ac Sights. On loading data for arrow as follows ace 620/ Beiter in nock/ 45mm spin wgs/81grn point/670mm shaft only length you calc wt is 261 my actual arrow wt is 251? Is this ok or is something wrong

[James Park]

Yes, I calculate 261 grains as well.
However, it will make very little difference.
The arrow mass is used to calculate the aerodynamic drag, and a small difference in that will make almost no difference to the settings (you would not be able to detect it). It would certainly be close enough for me.
If you do want to get it exact, simply change the point weight.
I will, however, check to make sure all the data in the program is correct.