measurements
What brand bullet and weight are you using?
You need to measure a finished round. Use your calipers and check the diameter where the bullet is seated into the case. It should be .375-.377" to fit the cylinder properly. You could be crimping to hard causing a bulge in the case.
Check the bullet diameter .357-358".
When loading different cases the case wall thickness can and will vary from brand to brand and lot to lot. How deeply are you seating your bullets? Thicker cases will bulge in the middle when a bullet is seated extra deep.
How far are the cases going into the cylinder before they are tight.
Now check these things out and maybe you will find out why there is a problem.
Good luck.
Bruce
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