You probably still have a slight ring of lead and/or assorted fouling in the chambers that are preventing the .357's from seating. Used to happen to me a lot with certain revolvers and types of ammunition.
That's what I was gonna say.
A 357 is a 357 not a 38 special. Yes you can shoot a 38 in a 357, but it is not designed for that and as a result you have lead and/or powder build up at the point the 38 ended. Clean your gun and shoot the right ammunition in the future. By the way what did you girl friend being a liberal have to do with this question?
"You probably still have a slight ring of lead and/or assorted fouling in the chambers that are preventing the .357's from seating."
You might be right. When I cleaned it, I only used solvent on patches, no wire brush as I don't have one... I'll have to try it. Thanks.
There's your answer.
The cylinder is cut for the longer .357s. Shooting the .38 will foul the clyinder between the end of the 38 case and the cut for the headspace for .357s.
Wet some patchs in bore cleaner, swab your cylinder and let it soak for 15 or 20 minutes, scrub briskly with an oversize bore brush if you have one. Like .40/10mm, or even a .45 brush.
Repeat as needed.