Have never used easton arrows before and when looking at their shaft selection guide for FMJs, the first question is medium cam orhard/single cam. I shoot a Hoyt Razortec with the Cam and a half system. Is this considered a medium or hard cam? Depending On what I put in it suggests a 340 or 400 spine.

FYI, I shoot the razortec, 29 inch arrows, 100 grain heads, 64 pounds, with a release. 340 or 400 spine?

When in doubt,go stiffer.It is a relatively hard cam.In your case,you are definately at the breakover point so always go stiffer in this case,which would be the 340.

What is your draw length?

Thanks, I was leaning that way.

29 inches

340 is just on the stiff side but .400 is too weak for broadheads.

If you use one of the arrow software programs like OT2 , it lists the Cam 1/2's as 1 cam hard.

I believe almost all bows now would be referred to as a hard cam. When in doubt, go a little stiffer on spine. From my past experience, the cam 1/2 system liked a stiffer spine.

Hard cam for sure.

I have a RazorTec as well and it is somewhat of a overachiever with respect to the KE it develops.
I would consider that a .340 arrow should spine just about perfectly for you if you leave it at about 29"

I shoot mine with a DL of 29" and 70# with .330 spine arrows at 28.5" and they tune about perfectly.