I am currently shooting the x-cutters with a 80 grain nibb and 27 1/2 inch arrow. I tried shooting the 50 grain nibbs but I couldn' t get them to fly right on 66plds but with the 80 grain they seem to do fine. Now you could try the cxls, but be prepared to buy a couple of dozen because their not a very durable arrow, but they fly really well.