Help dating old bullets

Found a couple old bullet casings and shotgun headstamps at a beach near Wellington yesterday, anyone here have experience dating things like this? I’ve done a little digging and the headstamps seem to possibly have been manufactured sometime between 1880-1920. Can anyone help me narrow it down a bit or confirm im on the right track?

Thanks!

TK

Cac is colonial ammunition company, ww1-ww2 era

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Top one is a .303 bullet shell, as stamped on it by the looks of it. A shame Lammerlaw isn‘t on here any more. He could have told you EVERYTHING.

JW :cowboy_hat_face:

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