For you guys that shoot darktimbers what spine you think would work with a low 40's FF longbow cut to ctr.   

What length and point weight?

28"-29" and point will depend on how they bareshaft for me but i already have some nice 200gr heads then with a stock aluminum insert.

Big Jim would be good help. I'd say .600

Thats were i was leaning too,, 600 is the minimum if i wanted brass inserts too!

Ted, if this helps im shooting a ctc lb too. #40@26. My arrows are GT Trads 500 spine cut at 27". I need 300 up front. 150 insert 150 bh.

How are they flying do you get alot of dive in the front?

20 yds is my max at a deer! They just start to dive. At my favorite range of 15 yds they are good.

Pretty good

I'm shooting 400s 31.5" long with 100 grains plus the 18 grain aluminum insert up front at that DW.

I shoot 700 and 800s out of my 42# Whip, but it's more like 38# at my draw length.  Im not a fan of very heavy arrows as I find anything over 11 gpp has more drop between 20-30 yds than I like (many of our 3d targets are set within that range).  So I shoot for 380-410 grs. 

Either one will tune just depends on how long of arrow you want to shoot. 29 1/2" 600 with a 250 gn. head or 31" 500 spine with about 300 up front. Ya just have to try one to find out. Gap shooter will like the 31" better, split finger instinctive will like the 29 1/2 "

okay thank you everyone, I ordered the 600's with all the different inserts