Hi Mike,
I got the info below from a post on the Internet, but I can't remember exactly where, or who posted it. Sounds like it is good info, and I would give the guy credit if I remembered who it was. This is what he posted.
I've seen a couple threads inquiring about this and as I had some questions myself, I called Easton and got it from the horses mouth, so to speak. According to Cody at Eastons tech line these are the specs:
new 500 shaft-has a true .500 static deflection which is approximately 65# of dynamic spine. It is a 20/64 (5/16)diameter shaft that uses 2016 components, however, the 500 shaft is a little stiffer than a 2016 which had a static deflection of .531 and 61# of dynamic spine. The 500 weighs 10.6gpi.
New 400 shaft-has a .400 static deflection, uses 2117 components and like the old 2117 is 21/64 diameter. No real difference between the two sizes. The 400 weighs 12gpi.
New 340 shaft-has a .340 static deflection, uses 2315 components and like the 2315 has 23/64 diameter so uses 23/64 nocks. This is also similar to an old 2216 in spine only. The 340 weighs 11.7gpi.
New 300 shaft- has a .300 static deflection, uses 2317 components and like the 2317 has a 23/64 diameter. The 300 shaft is also similar to the old 2219 in spine only. The 300 weighs 13.3gpi.
I used "had" and "old" only to compare with the gamegetter II's no longer in production. The old sizes/spines are still available(for the time being) in the legacy and other higher end shafts.