If you’re loading wad cutters, they are probably sized to .358 or up to 360 in some cases. When seated into the case, the long shank of the bullet starts to impinge into the tapered part inside of the case causing it to bulge outward and create the ring you are taking about. This seems to be a problem, especially with the wad cutter, because of its long length compared to other 38 bullets. Try seating the bullet farther out of the case and see if the problem subsides. You really only have to seat the wad cutter flush with the case mouth if you are using it in a semi auto like the mod. 52. If it’s a revolver then it won’t matter if the bullet is seated out of the case a bit.

Unloaded, sized cases should go in and out of the chamber without too much difficulty. Sometimes however, the case mouth is flared a bit, even after the resizing process, and grabs the sides of the chamber somewhat. This is normal but the case should still enter the chamber with only a little finger pressure.