Or you could call 3Rivers and talk with them. 60@29 means you need a 30 inch arrow, add 5# spine for every each inch over 28 inches, plus 5# for a 125 gr head…. I would think 70-75 spine would get you there, 75-80 probably too stiff for an ML 14. You can get a 3 arrow test pack from 3Rivers and try different spined arrows.