Right now I'm shooting a goldtip velocity 340. They weigh 365 grains and I'm shooting them at 310 fps at 72lbs. I'm thinking about pitting heavier inserts in them to increase foc. The gold tip foc calculator shows 10.7% foc right now. Gold tip sells 50 and 100 grain inserts. If I went with the 50 grain I should be shooting a 403 grain arrow at 298fps and 13.9% foc. If I went with the 100 grain insert I should be shooting a 453 grain arrow at 282 fps with 17.3% foc. My main concern is would I be under/over spine with either? Is there any noticeable different between foc from 10%-17%?
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