This is what I do. A single sandwich bag for 10 or so and a big bag for 100 or so. then
mark the load on the bag with a sharpie.
Same here, especially when making small test batches when working up loads. No need to get fancy.
Once load development is done, I just use those cheap 50 round reusable plastic shell boxes with the flip up lids and make a sticky label for each and slap it on top. Next batch, if different, just slap a different label on top of that.
If mixing up loaded magazines is the issue, then just color code the bottom of the magazine with a dot of colored plastic modeling paint or enamel touch up paint. Different color for each different bullet type/weight.
For larger batches, I just put them in the traditional metal ammo cans and slap stick on labels on the can or put an index card inside.
This is not rocket science. No need to mark the ammo.