they're not better. If you look at the specs you'll realize th acc pro's are straighter, have less variable in thier weight per dozen, and are heavier for better Kenetic energy down range. If you want tighter groups use the easton acc pro's, they're probably the best hunting arrow on market right now, unless you get lucky and find some Easton ac super slims which through all the testing I've done rank as the best hunting arrow that I've ever shot, and I build custom arrows and have shot a lot of different shafts as my customers are predominately Hunting club hunters and they tend toward the best equipment that they can get and I tell them to shoot both the maxima's and the acc pro's and judge for them selves and 8 out of 10 will buy the eastons. They spend a lot of money just to hunt and want to use the best equipment to enhance their chances. Take the test and you too will buy easton. I'm not a factory man just a hunter like most of us. But if you want the best !!!!