I have a bit of experience with this cartridge. You can find brass pretty easy, norma is available from a few sources.
You can use 25-35 cases and run them through a FL sizing die. Bullets are the issue. I use custom made 70 gr .228 semi spitzer.
Hornady made some .227 spitzer bullets a while ago but they seem to be designed more for the European rifles 5.6x52R than your slow twist 22 high power.


Headspace is a problem with this rifle/cartridge and the cases stretch a lot, this will lead to case head separation. You need to check the case shoulder with a headspace comparatorand set up your reloading die to not bump the shoulder back to much. I bump it .002.


I load 25.0 Grains of IMR 3031 and 70gr bullets, shoots excellent, fun toy to shoot.