The AI sorter will sort 9mm/38super if you train the headstamps well.
Otherwise a 3d printed sorter like FFB offers is very good as well if they are similar diameter cases like 9/38/380, 40/10mm, etc.
115 and n320 in 38 super is probably most common. WST and Titegroup is an option here as well.
115 and Titegroup, with n320/n330 for 9mm is popular. I tried sport pistol but it liked more MV/recoil when at the same precision as Titegroup so I ditched it.
There are a few shooting 124s but not a ton.
It's when the spent primer corrodes into the pocket and only the top pops off when you deprime it. Usually because the brass sat outside for a while or someone wet tumbled and didn't dry the brass fast enough.