LAST EDITED ON Aug-07-11 AT 00:08AM (MST)[p]Rich, from the studies I've read on bow efficiency, bows are most efficient between 7 and 8 grs an inch of arrow weight per pound of draw weight. At 7.5 grs per pound that would give you a 450 gr arrow which will work well for elk.
So what I would do with your set up is use a 7595 Goldtip XT Hunter Black cut at 28.75 shaft length, not to inside of nock - that is extra, but shaft length. Then use a 50 gr brass insert which will greatly strengthen the insert end of the arrow far beyond anything made out of aluminum. That brass insert also helps shaft strength while also raising foc which improves penetration and arrow flight. Use 3 blazer vanes. What you will end up with is a very tough 458 gr arrow that will fly a whole lot better then the underspined 400 you are shooting now.
If you do go to a 400 fmj cut the shafts to 27" and use a head weight of 100 grs. That will be spined correctly and the arrow will weigh 418grs.
"We must hang together, gentlemen...else, we shall most assuredly hang separately."
BF