I found it interesting so I got his permission to reprint it here.
Cut the .22 case down to about 1 inch in length
Size in the 7.62 x 25mm Tokarev die
trim to correct length of 0.980" and inside neck ream to 0.308"
Check your dimensions
if satisfied resize again, prime, charge, seat bullet. I've found that standard seating dies will crush the neck if there's even a little difference in the case length.
We used Tite Group powder in the 4.0-4.9 range, CCI 500 primers and 110gr .308 Xtreme plated bullets.
no over-pressure signs, loads almost felt like factory.
In researching this (which I have a habit of doing) I found that there is more than one way to accomplish this.
The other method is to buy the kit from RCBS, which includes a cut-off die with a hardened top plate for cutting and filing the brass to the proper length. The second die forms the case neck and has an open top in which a reamer (provided in the kit) is used to open up the case mouth to .308. The final die seats the bullet. See the process here
Of course the easiest way is to simply order new brass from Starline, at this writing the brass was in stock and selling for $175.50 for 1000 pieces. Then order a set of standard 7.62 x 25mm dies (perhaps including a factory taper crimp die from Lee?).
Buying new brass would take all the fun out of it.....I can see why some people would want to make dies from otherwise unusable .223 brass, its like recycling recycled components.......you can count me in that camp.