sometimes (rarely) if ya shoot say 10K rounds 38 special outta a 357 mag and dont clean the cylinders buildup can cause case sticking when ya use the mag ammo, it, but it takes a helluva lotta ammo, i have shot my L frame S&W tens of thousands of times w/the 38 special ammo ( i am a reloader and used to shoot this pistol a lot & have had it since '82 or so, it is an early 586 4" bbl) with never a problem, i guess i do clean the thing fairly regulary though.
i have also heard in some rare cases erosion can occur in similar circumstances, but again this would take a lot of shooting, and also a lot of very hot +P+ 38 special ammo, i mean if ya want hot loads why go with .38 when ya can go with 357 anyway??imho the casual shooter wouldnt have any probs w/this.
it can happen though.
as far as carry pistols as i said before its hard to go wrong with glock or poly kahrs for edc.