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This is large pistol primer. Are magnum primers tougher?
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Primers in general vary by manufacturer. Yes, some magnum primers are thicker but it also depends on how we choose to define "tougher". It's not always about primer cup thickness, the alloys used to make the sheet the cups were cut from or the priming compound mixture, different anvil angles and anvil designs. There is a large collection of variables and even within a single manufacturer those variables are subject to change lot to lot.
This is a pretty good read on Primers and Pressure you may want to take a look at. I always found these
Primer Flash Test Photos to be pretty neat to look at.
Ron