Brass Shotshell Crimp - General Ammunition Discussion

What would be correct name & time frame for the type of crimp on this Winchester 10 ga brass shotshell?

Back to the Future with Reloading Supplies

Shotgun shell question - General Ammunition Discussion - International Ammunition Association Web Forum

Reloading 5.56 Lake City Brass

Questions on this 44 mag brass loaded quite a few times. Case split here had 12 grains of bluedot with a 310 grain hardcast lead bullet. : r/reloading

What were shotgun cartridges made of before plastic existed? - Quora

Cases covered with soot - problem? Please advice!

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Polishing rounds : r/reloading

Mec 9000 Crimp Hole

Why does it seem like much more often than not when Hollywood shows a shotgun being loaded, it's with a low brass round? What gives? - Quora