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988 Posts
Most xbows or set for a certain length bolt from manuf. specs. for there speed and power.If you change bolt length the xbow may either be over powered or underpowered for the bolt.Also if something bad was to happen and manuf. found out you were shooting the wrong bolt you would be SOL. I have messed around with 3 diff. bolt lengths and have found that the 20" is the best for my xbow and the BHs I use. IMO I would not go more than 2" either way of spec. bolt length