For years and years I used .400" with a 62 pound draw weight and 29" of draw. CXL insert (28 grs) and 90 gr screw-in points. The CE CXL 250 was then my primary arrow. Speed 293 - 295 fps. Accuracy was excellent. Arrow weight ran from 313 grs to 327 grs.
Different diameter shaft, the CE CX300 (.370" spine) shoved them with 67 pounds with the same 29" of draw. CX insert (11 grs) with both 100 and 125 gr points. Again, speed and excellent accuracy. Speed up to 280 fps. Arrow weight 375 grs up to 383 grs.
The strength of small diameter shafts is better and large diameter shafts of the same spine.
There are of us that wish CE would bring back the CX300 (.370"). Some of us pushed them with 70 pounds of draw weight. A bit shorter with overdraw I used CE CX200s (.458") and just plain kicked butt on our 3D circuit......
I once tried to break down the spine of .350" diameter .400" spine. I started with a 80 gr glue-in point and finished with a 192 grs point weight. Accuracy remained excellent throughout for yards tested from - 20 and 30 yards.
Another; I used a CE CXL 150 Pro (.500" spine) and launched it at 62 pounds. Speed was fantastic and accuracy outstanding, but it couldn't take the sudden stop in a target up close, 25 yards and under.....
Right now I can't think of a reason to have a .340" spine arrow.
Bottom line; Like someone noted above, try the .340" arrow and compare to the .400" spine arrow.
