RE: HOW DO YOU DETERMINE WHAT GRAIN OF BROAD HEAD TO USE.
I agree with straightarrow if you have a broadhead on the tip it helps a lot to put some drag on the back end to stabilize the arrow. I shot with regular plastic fletching then switched to synthetic feathers and noticed a huge jump in my broadhead accuracy. I would definitely recommend synthetic feathers to resist damage from weather. I have shot them in snow, rain, heat and extreme cold and the synthetic feathers have always worked very well for me in all conditions with broadheads.