Shoot what groups for your form and setup. ACC is a great arrow, and groups just as well for 3-D as an all alum. arrow. Some carbons are getting knocked because of weight and spine variations, and the fact that they don't group out of a shooting machine as well as alum's. I personally however, have gotten better long range groups with carbons. Shoot what works!
I was told by several Pros. Linecutting for 3d. I know my scores were as good or better with 2312. I do beleive Aluminums have better tolarences. I would just watch a see what most pros shoot. Aluminum arrows. Acc will be my next choice if shooting carbons next year.
I use 2512's. 2514's for hunting, and either for spots. You do lose speed though, but if you judge yardage well and are sighted in, it should not be a problem. As DB said "cutting the line" is also an advantage of a fatter shaft.
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