Just weighed mine on my scale, I've got bemans 400 8.4 gpi at 28, 4" vanes and 100 gr tips,mine weigh 391 your arrows weigh 44.8 grains more than mine which gives you 438 if the weight differance between vanes and feather is 17 grains than neman1 has it figured for you.

Newman how did you figure the foc? I have it somewhere on my comp. thank you.