40 brass seems to be pretty easy to get and the small pistol primer is correct.

I've loaded a bunch of the 175 TC and 175 SWC and the 180 SWC to great success Like many I have to use the powder that I can get, I concentrate on W231 and Clay's and really like it, At one 3 day training event I shot 1700 rounds in 3 days after the second day I had to clean and all things considering leading was minimal

I did use some autocomp and it just seemed very loud in relationship to other loadings, I had some flyers that I couldn't explain, I didnt use enough of it to blame the powder or if it was conditions for the couple days that I shot with it. I won't knock the powder but I would pick my 231 over autocomp.

All in all, I put the easiest calibers to load for as 38, 40, and 45 acp with now rank among those