I shoot a 66" 60#@28" R/D drawn to 27.5 I shoot both the 250's and 350's. With my bow, form, release, etc. the 250's worked great with the standard aluminum insert and 250 gr. point weight. Total arrow wt. is 603 gr.
The 350's needed a 100 gr. brass insert and 250 gr point wt for a total wt of 720 grains. FOC with this set up is near 23% and they fly great.
Both arrows are cut 29 3/8".
I used the 350's last year on my moose hunt for the extra weight as well as the FOC.
I have since developed another arrow system with a Victory V Force HV 300, 100 gr. insert, 1" footing and 300 gr. point wt. for a total arrow weight of 645 gr. and and FOC of 31%. They fly like lasers