The pro 22's are a .300 spine arrow, and I shoot them w/ a 31 grain insert and a 65 grain pdp screw in point, so as you can imagine they spine for about a 100lb bow. They shoot great out of my 70lb Apex 7 as my primary IBO 3D and local 3D arrow, and during the summer time I am actually shooting spots games with this bow as well and carrying a respectable mid to high 440's average.

The 30X Pro's are actually a .150 spine.............yeah that's right. I shoot them w/ 180 grain points for spots out of my regular Apex @ 57.5lbs, and out of the Apex 7 with150 grains up front @ 70lbsfor ASA 3D. They are 26/64's outside diameter. They shoot lights out, much better than my 2512's did cut long and with LOTS of weight up front to break down to appropriate spine.

All of these arrows shoot bullet holes in paper after doing a walk back tune. The thing I have found is that they MUST be cut about 1/2" in front of the blade, and that blade thickness seems to be critical, they seem to like a thinner blade, I shoot a .010 blade.