Help with arrow spine.
 

So I'm having problems finding the correct spine to shoot. When I look on different manufactures websites they are telling me to shoot 400's with my set up but when I use archers advantage it is telling me that 400's are slightly weak but 340's are marginally stiff. I guess I should probably buy a couple arrows of both spine and shoot the one that groups the best but I thought I'd ask here first before spending the money. Specs are listed below. Anyone else have these problems when trying to find a correct spine?

IBO 325. Pulling 60-64 pounds. 29" draw and arrows cut to 28". 100 grain points/broadheads.

400's

Arrow spine
 

^^^X2^^^

Try the Carbon Express selection chart on their website. Looks to me that 350's would work for you.

I might option for the 340's you've listed.... Would give you the option to bump your BH weight up in the future without changing arrows? But confirm PRIOR to purchase....

I initially bought 340s (FMJ, shooting 29.5" @ 70#) and had 100 gr points on. Chose to go with a heavier point to bring arrow weight up a little and had to replace the 340s with 300s (which was even better as my overall arrow weight jumped up again with the 340 to 300 switch - a win/win situation for me)

J.

Thanks for the advise everyone. I went with the bema ics hunters in a 400. Was able to cut them down to 27.5 with my rest and they are shooting amazing! 403grains finished weight shooting 276fps with 10% foc.

400 shpuld be fine but both should fly fine as long as your bow is tuned.