Mike, everyone has some good info, but let me tell you my experience with them.
I use the 250's cut 29 1/4" long with 200 up front with my Wes Wallace 50#'r, and they fly super.
I also use the 150's cut 29 3/4 long with 175 up front for my Lonewolf 45#'r, also with amazing results. I have tried and tried to get my 150's to work with my Wes, but to no avail, i have every available point wieght and weight inserts, but still..no good. I dont know if this is because the Wes is just a hard shooter or if it's the fact that the 150's are rated for 50# or less. anyway thats just MHO. But like fatman said, you could always get a test kit. Keep us posted.
P.