ORIGINAL: Rangeball
Hmm...Lighter??... If what I am reading is correct acheiving a "hunting weight" arrow in a carbon won't be a problem.
I guess it depends on your classification of "hunting weight".
My finished 3/49 ACCs weigh 375 grains. The axis in a similar spine weighs only .7 more grains per inch. Not a lot more weight...
Assuming a 28" arrow, yeah not a lot more.
Jump up to a size 340 w/ 125 grain points and feathers and you should be fine spine wise for a hard cam 70 pound bow at 28-29". And you'll get the added weight you are looking for.