Gary, if you shoot a 125 grain broadhead mounted on a long adapter you will be closer to 145 grains. You may need to shorten that 1816 an inch or more. I got some 18/64 145 grain target points from 3 rivers to match that set up for those here that preferred the 1816s over wood. I also found that out of a standard Hill style set up, that 45-50 Wapiti tapered cedars with 145s worked the same for 26.5 to 27.5" bop arrows out of the same bows. Which for me is really convenient, because a number of the guys that I make arrows for fall right into the spans of 45 to 55 spines with 145 grains and thanks to the Ribtec sale, I have lots of 145 grain Ribtecs for them.