What you can do, and what you should do are two very different things.
It depends on the gun, but some certainly are capable of firing cartridges that they were not designed for. I have watched a YouTube video of a guy shooting 9mm through a 9x18Mak, and they aren't even the same diameter. The gun fired and spit the case out fine, but, the gun essentially fired an overloaded round out of battery.... it is just not a good idea. Unless you are using a Magnum/Special caliber, shoot what the gun says it is chambered for.
Long story short, technically your buddy could be right, but I would find someone else to go to the range with.
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