"If a gunman wants to kill lots of people....the ability to keep pulling the trigger rather than to pause to pull out and replace cartridges 10 times is a big advantage."
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....except, you know....in this case, where he expended 60 rounds and killed......no one..
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"So what's a "high capacity cartridge?""
no, genius:  what you're trying to say is "high capacity magazine." (sigh)
..."Glock states that the standard cartridge...."
(sigh) no- still "magazine," genius-- not "cartridge."
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If you've never actually seen a real firearm, the absolute least you could do is use the proper terminology when talking about the subject.
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And way to prove that the term "standard" is subjective, based on the make/model/group you talk to-- thanks.