I wouldn't get too hung up on projectile weight at this stage. If you are going to collect modern sporting ammo the weights are easy to find, usually. Likewise most military.
Very old ammo, not so. You can research online for that info or if you end up joining catridges collectors they have a wealth of knowledge and can help.
Weighing complete catridges - I have some sealed packets (beautifully tied with string) but in some cases no loose examples of same. I wouldn't dream of opening the packets to get at a single catridge. Substantial value would be destroyed.
I also have a few copies (years 2017, 2018?) of the NZ Cartridge Collectors Club 2 monthly magazines that you can have which would give you insight to the more serious collecting.
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