ORIGINAL: bigcountry
I suggest possibly a tune issue if your seeing a huge flight difference. Technically, a perfect form, you wouldn't even need vanes.
4-5" feathers would blow any of them away.
BC,
It's slight, but out at 50yds or so, it's a bit more extreme, groups go from 4.5-5.5" to 6-7.5" or so. But it's enough that I'll stick with my Blazers.