I'm done with Starline. I shot everyday for the last 5 days shooting some new cut down 2.6 to 2.5 bases and had 4 pull apart at the mid section and two cases have identical cracks at this same spot. The once that pulled apart look identical at the same location and the way it separated. These did bot show signs at the base but these are at midsection.
Now Gary before you ask

no, no moisture in the chamber. No sizing lube on the cases. No plastic wads. just 030" fiber wads. clean cases and .100" compression.
Starline has been contacted twice with no response. I have 600 cases I'm about to box them up and send them to them and tell them to stick them. I'm done with them!!!
If I had a sloppy chamber and full length sized them at every loading I could expect puled brass, but this chamber is so tight it will only take a PP bullet and the brass does not need sizing. This new brass has not been shot more then five loadings and some that pulled apart was on the first and second loading.