Originally posted by HATCHCHASER:
I have found carbons seem to react more to length than point weight.
Very astute observation, I concur...
Yesterday I was fiddling around and put a 50 grain brass insert in one of my 29.5" 4560 CX Terminator Hunters. This brought the weight up to 530 grains from the normal 480 grains with a standard alum. insert (T-Hunter has a higher GPI than most carbons due to the full length Buff Tuff wrap, one of the reasons I love em'). I also was shooting a 30" 6075 Terminator (same shaft, no Buff Tuff wrap)which weighs 485 grains.
This 30" 6075 duplicates POI with the shorter 4560, and I can shoot them interchangably. I found that the 50 extra grains up front on the test 4560 did not affect horizontal POI, but as to be expected it did hit a bit lower than the lighter arrows.
One would think that adding that much more weight up front would noticably effect spine, but as has been my experience and as Hatchchaser noted, length seems to be a greater factor...