I usually put an extra inch of shaft on my arrows. For one thing, so if the tip breaks off while target shooting, I can just cut it and replace the point and I'm back in business. And with broadheads, no chance of drawing the blade into my finger.
On feathers, turkey feathers are absolutely authentic for Native American arrows. Many people think that Native arrows were fletched with raptor feathers. But this was usually for ceremonial arrows. Raptors are very hard to take and, usually, there was one guy in a tribe who specialized in catching raptors and it could be a painful experience the way some tribes did it. But raptor feathers are not as rugged as turkey feathers so turkey feathers were the popular choice since they were easier to acquire and were more durable. When you spend a day on an arrow, the more durable the materials, the better.
Now, the Hopi have a Kachina dance that requires arrows fletched with black feathers. Back in the day, these would have been crow or raven feathers. But now, most Hopi just go to the archery shop and get black fletching. It isn't where the feather came for per se more than the color. I helped out some Hopis with some black banana cut fletching I had when they were looking for it and the archery shop sold out.
As far as European fletching choice, I think they used mostly goose feathers back in the day. The Japanese did use golden eagle feathers and I've seen those arrows.
So, don't be dismayed about the hawk feathers. You can use turkey feathers and be totally authentic. And they're more durable in the long run.
