My dad just got a horton 150 legend hd with 3 aluminium 20" bolts. We both love shooting it. I have been searching the web for 20" carbon bolts but my question is I am A vertical bow shooter (be nice I dont bash horizontal archers) so when I buy arrows I make sure spine is correct. (tip weight, draw and poundage of bow and so on) I have recently noticed from various dealers and manufactures for bolts that there is no info on spine, bow poundage sizing chart etc. So what I am seeing is that a 20" bolt fits all 20" crossbows regardless of tip weight, poundage, draw lenght. That doesnt make sense to me please shed some light on this. Thanks