Keeping them identified.....
Keeping different loads segregated can be a problem.
Right now, before you have the cartridge boxes, I'd take a fine-point permanent felt marker and write the actual charge weight on each bullet or case. Then, it won't matter if the cat scrambles the whole bunch and mixes them up.
For load development and most other purposes, I use fifty-round boxes. I place the cartridges in the box with bullets down, and use a felt-marker set of four colors to mark the primers, black, blue, red, green, or 'none'. At ten- round samples per color, this identifies all fifty rounds.
If the number of test loads gets bigger, such as in hundred-round boxes, the same colors may be used by making different marks. The red marker, for instance, could be used to draw a single line, or an "x", or to completely cover the primer with color. Anything that's clearly different from any other marking will do.
On the outside of the box, I place a stick-on label (from any stationery department) about 1/2"x 2.5", with either the basic info on each ten-round sample, or an identifier to link that load with my Reloading Diary. Each label gets a felt marker color-mark in a pattern to match the marks on the primers in the two rows of five to which it pertains. The labels are placed vertically "on edge" adjacent to the ten rounds each label describes (5 labels per box of 50).
Even if the whole danged box gets dumped, it's easy to get them back in order using this method, and it only takes mere seconds to mark them. It's saved my bacon (and test loads) on several occasions.
You MUST keep decent records of all your loads, or you're going to be working in the dark!!!! At the very least, get a loose-leaf binder and make up some sort of table for your records. I'd suggest, at a minimum, recording the the date of loading, the bullet type, weight and manufacturer, the powder type and charge weight, the primer type and make, the brass manufacturer, and the overall length of the round. A section for remarks is a good idea, too. You'll appreciate the records in the years ahead, believe me.
Enjoy!