Tipoc is dead on IMO. I debated between .38 and .357 A-Zooms and the deciding factor for me was that .357 "load" quite differently when using a speed loader or strip (that slightly tighter grip clearance does make a difference!). So I bought the .357 caps since I wanted to become proficient in loading my carry ammo.
Ivan
EDIT: BTW, the .357 A-Zoom caps will not work in a .38, since the "brass" section of the cap is longer, the .357 snap caps will stick out the back of the cylinder about a sixteenth of an inch and you won't be able to close it. Filing down the bullet end is irrelevant.
Ivan
EDIT: BTW, the .357 A-Zoom caps will not work in a .38, since the "brass" section of the cap is longer, the .357 snap caps will stick out the back of the cylinder about a sixteenth of an inch and you won't be able to close it. Filing down the bullet end is irrelevant.