I have a 22-30/30AI and making brass is not all that difficult. Take 30-30 brass and run it through a 7-30 walters die. Next, I run it through a 6.5 neck die made by Hornady. This die was about $15 and it is designed to do just that, neck down to 6.5. Finally, I run it through the 22-30/30ai die and that's it.
The 22-30/30ai, as said before, will put you in the same class as a 22-250. My goal was to have a "hot" 22 with a rim. I already had the dies, and got a great deal on a 26" 223 Encore barrel. I had it rechambered to the 22-30/30ai and the whole thing cost me under $200.
If I did not get such a great deal on the barrel, I would have ordered a 225 Fox Ridge barrel. After all this, I was wanting a similar setup for the pistol and ended up calling Ed T/C's and he had a 15" full bull 225 win Fox Ridge barrel in stock, just what I wanted! I have been playing with this for about 3 months now. The 225 win definitely has its advantages, mostly the heavier brass. But, if you just have to have a wildcat, the 22-30/30ai sure is a good one (if you don't mind making the brass)
BTW, the 225 win brass can be had for around $10 for 50.