I shoot a 500/3555 spine arrow 30" long with 245 on the front from my 45@28 drawn to 30". I need some longer arrows as soon as I break or loose the ones I have. I shoot my 51@28 drawn to 30" with a 30" arrow with 300 gr. on front of 5575 GT trad. I just cut some new ones for that bow that are 31 1/2" and they are close with 200 up front. I am shooting for 225 on the front so maybe someplace around 31". My bows and arrows do not compute on Stu's calculator. They do once I get my arrow spine, but the arrow doesn't calculate for the bow. I am running about 10# light on spine with my arrows. Both bows cut to center and R/D LB's with very good cast. I can shoot stiffer, but this is who they way they like it best, shoot where I look. To many shooter and bow variables to calculate. Always start long and work down with different point weights.