Re: Keep reloading same batch or go through all first
I weigh my deprimed brass after their first firing/cleaning. I find it's better to group the cases by similar weights. This helps provide more consistent case volumes within a given group. Volumes vary by more than just weght differences, but it still helps.
Once my cases are loaded, I mark each group by swiping the case bases with a broad permanent magic marker (like a Magnum 44), a different color for each group. This way they stay segregated throughout the many reloading cycles. This swipe needs to be renewed after cleaning the cases.
I find it's better to establish and maintain separate groups, so things like brass work-hardening affect an entire group relatively evenly. It helps accuracy by ensuring that work-hardening related issues, like neck tension, don't become randomized by mixing groups. Also, when primer pockets begin to open up, I know which cases to watch.
Greg