The nock end on a swaged shaft is pulled, or drawn to a smaller diameter. You can see and feel the reduced size. The X7 is very hard, and they may not have done it.
Here is an explanation, that I found online.
Easton says:
*The 2214 X7 closely matches the 2215 XX75 and will shoot very nearly the same from your bow. The 2214 is only 7 grain lighter in weight and .010" weaker in spine @ 29" than the 2215 XX75.
The following products are available from Easton; the X7 is a 7178 alloy. The closest is their Super Slam 78 shafts, but they do not come in 2214, but are available in 2215. Eastons then says:
"75" = E75® and all XX75® model shafts - Autumn Orange®, Easton Classic™, Advantage™, Camo Hunter®, GameGetter® II and GameGetter® (7075 alloy)
"X7" = X7® Eclipse® shafts (7178 alloy)
Try the following chart. At the bottom 3Rivers has Carbon, Aluminum and wood. Along the bottom of the Alu. it says the 2215 is "I", next go to the matrix chart and for your arrow lenght, or draw length, using a longbow, or recurve it will give you the weight. Their link is:
http://www.3riversarchery.com/pdf/ArrowCharts.pdf