Chad,
Since you usually shoot wood arrows anyway, I believe I would just stay with them. A wood arrow that spines enough will probably be around eight grain per pound anyway. I also remember an article a while back about soaking wood arrows in oil (linseed, maybe?), to add varying amounts of weight to make them more uniform. It added quite a bit of weight, waterproofed ' em too. Of course they added a finish over them also. You didn' t say what kind of bow it will be, but I assume you' re talking about a Crusader. The Crusader having a longbow riser, it will take a lower spine than say, a Hunter ll would. What are you huntin' anyhow?

Darrel