Until I discovered that Starline produced 9X18 brass, I used a Forster trimmer with a .355 pilot. There is a .365 pilot available, but I feared it would require over expanding the case. I still trim down a lot of nickel 9X19 once fired case, fire form them with a target load, and use them for strong 9X18 PD loads. It is easy to distinguish them from my 9X18 target loads.
I have also experimented with 7.62X25 Tokarev, which worked well as a 9X18, but a pain to cut down compared to 9X19. I also discovered that the 7.62X25 could be trimmed to 23mm, loaded with black powder, a home made OP wad, and #9 shot as weak snake load. It had to be hand chambered and extracted.