Please take a photo and show us how the loads are not fitting.
As referenced before, if your crimp die is not properly set, your case will bulge near the rim. The is especially prone to the Dillon where you don't have a lot of case being supported by the shell holder AND your sizing die does not come down far enough to size this portion of the case. If you read the current Handloader magazine, they actually show a photo of 357/38s with the bulge in the case from the bullet. This bulge is not a bad thing. When you have the bulge near the rim from the crimp die, you can hardly see it.....until you go to put the round into a revolver cylinder. The case goes about 3/4 of the way in and stops.
Don't ask me how I know all of this.......
I ended up buying the Redding Profile crimp dies for all of my competition reloads. I also measure the cases more often.
Don't ask me how I know all of this.......
I hope you are able to resolve your issues with the sizing die. If not, you may be pulling bullets to save bullets, powder, and primers.
Don't ask me how I know all of this.......
Steve