When doctoring up a magazine with spent rounds to work on malfunction drills, will the spent round when fed from the magazine into the feed ramp cause any damage to the ramp?
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Don’t see how brass could damage the Feed Ramps. Do you have M4 Feed Ramps?
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What is harder, brass or steel? 
No, but that is a good way to get a case stuck.
Okay, I get your point. 
Was referencing a semi-auto handgun, specifically a G17
Not sure which malfunctions you’re trying to simulate, but I’m confident dummy rounds would accomplish the same thing and avoid other unnecessary consequences.
Yep, hard to crush a steel ball with a rubber mallet, same applies here.
Have seen this done before. They wouldn’t feed at all, usually ended up in stovepipes.
Snap caps or dummy rounds work much better.
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Unless you’re looking to practice for a failure to feed. Snap caps don’t simulate the same failures as a spent casing would.
No…