This is the first set of limbs I have bought. I am new to archery, although I used to shoot target crossbow 33 years ago. The limbs state 36 lb, I will buy 40/42lb limbs soon. I have been shooting these since Easter.I do not change the nocking points on the string, they are set in superglue on both strings. The lower nocking point is 4mm above the horizontal of the arrow rest (Spigarelli zero tolerance win&win fit,Shibua button). At present I can only shoot 20 to 80 yards on my Arc sx10 scope without moving the scope back (I have not done this yet). I will possibly buy a new string and button for winter indoor shooting with my X7's, outdoors I shoot Navigators, and do not wish to change a good button setup.