Well...it doesn't sound too normal! Never heard of anything like that, even thouhg you do have a really fast arrow. What do you mean by you can use your 10 yard pin to 40 yards? You arrow has to wander off the point of aim somewhat by that point.
If I had a .22 long rifle slug moving at 1100 FPS, and I sighted it in at 10 yards, it wouldn't be on target anywhere from 10 to 40 yards out, and that bullet has a little flatter trajectory than your arrow does.

I'm sure you're got one flat shootin machine, but being right on from 10 to 40 yards with the same pin is pretty tough to swallow.

peashooter