I had some Remington brass that I got 3 or 4 reloads out of after fireforming them to .22 K-Hornet from factory ammo. I can't say exactly what the loads were, but I did try some 52, 53, and 55 grain bullets along with some 45 grain bullets. Not sure exactly what powder I used with which bullets, but I got the data out of reloading manuals (Hornady 6th and Lyman 48th, I think). I'm not 100% sure why they started splitting in the neck and shoulder area.
I bought some Winchester brass to replace it. I haven't fireformed those yet, but will anneal them after fireforming and see how they turn out.