I have a cheapo caldwell chrono, but in this particular day I did not have it out with me when the case separation happened.Presume you did not measure speed while firing these rounds?
I am going to remove the rifle from my chassis and have it inspected.
I am also going to scrub the carbon ring out.
I did finally buy some lapua brass to try out, but in the meantime I chucked about 140 pieces of brass that were the same lot as the cases that separated. (which I just processed last week, not amused at that lol)
I de cap, tumble in corncob, lube, resize, run mandrel down necks to set neck tension, re tumble in corncob, trim, then run across my case prep xpress chamfer deburr, uniform primer pocket and brush necks.
Soo all that work last week down the tube haha oh well I still have 50 pieces of once fired I will get prepped this week.
Assuming all is well with my gun I'll still be able to do my local turkey shoot this Saturday and try to win a turkey