When I bought Exocet 200 I went through 4 boxes of stock Excalibur GT II's and had consistency issues with almost 50 percent of them. I was lucky to get 3 bolts out of a box of 6 that would group within 1" 20 yards. Individually, each bolt would shoot bullet holes but as a group they sucked. I solved my problem by buying raw shafts and fletching my own. My set up now is GT II's, 2" blazer vanes and brass inserts. Think about it, why do you think Excal switched to the Easton bolts.
Rich
excalibur bolts and accuracy
bolts
I make my own Goldtips from shafts 20"in. and never have had a problem yet. Not one. and like bstout, never had any problems with breakage either. Only one ever broke and it was clean in half, and I mean clean.Ole!!!! 
Phoenix - 375 gr. BEE's (babyneilsons)
Micro 315 - 410 gr. Zombies/Lumenoks
Micro 355. - Punisher-Zombies/Lumenoks
Arrowmaker - Retired
rem.exc.shooter@hotmail.com
Micro 315 - 410 gr. Zombies/Lumenoks
Micro 355. - Punisher-Zombies/Lumenoks
Arrowmaker - Retired
rem.exc.shooter@hotmail.com