Jeff, at 20 yards, 300 fps it's even more critical. That arrow has to become stable VERY quickly.Everything is amplified w/ speed. Every small form flaw, twitch....the faster the arrow is flying, the less forgiving it is. Now add to that equation an arrow that's not spined correctly for the bow (either over or under) and it's less forgiving still.

There are ways to get the weight you want w/out overspining yourself. Let's just say you need to shoot ACC 3-60's to get the proper spine for your set up, but they are too light for what you want. BUT, the 3-71 is the weight you want, but it's overspined. Ok.....don't cut it as short. Leave it an inch or 2 long, that will "weaken" the spine, and make for a more stable arrow anyway.