Tuning your crossbow bolts will help you tighten your groupings and will ultimately be a key part of your success.
To optimize your accuracy you need to understand what affects your crossbow bolts flight. The front of center of F.O.C. of your bolt can have a big influence on accuracy especially at longer ranges.
So what exactly is F.O.C.
F.O.C. describes the percentage of your crossbow bolt’s total weight that which is located in the front half of the bolt. The more weight that is located in the front half of the crossbow bolt, the more forward is the crossbow bolt’s center-of-balance.
The F.O.C. balance position of the crossbow bolt is one of the more important elements affecting the shape of the crossbow bolt’s trajectory curve. Ideal F.O.C is especially critical for target shooters participating in long-range shooting competitions or hunters that are pushing the their crossbows to the maximum shooting range.
While F.O.C is less relevant in some crossbow hunting situations (short-range shots), it can be critical in those long-range situations or if your shooting a crossbow with a low FPS rating. A high F.O.C. will fly with good stability, but will shed its trajectory quicker and nose-dive. While a crossbow bolt with low F.O.C. will hold its trajectory better, but can fly erratically. For hunting situations crossbow bolts with 10-15% F.O.C. for hunting setups and optimal accuracy.