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Fatboy question?

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I'm looking to shoot Easton Fatboys out of my 2011 PSE Evo. Set at 72 lbs. and a 28.5 inch draw. What spine should I shoot? 400 or 340? Arrow length is 27.5 inches.
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You are right on the line between 400's and 340's. Here is the link to the Easton shaft selector sight:

I would lean towards the 340, leave the shaft about 1/2" long (28") and a slightly heavier tip. That's the route I would take. Some would go the opposite direction, go with the shortest shaft and a lighter tip.

But the absolute best advice I could give, is shoot a 340 & 400 through paper and see which gives the best result. That usually isn't possible though.
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