Again, the reason "trick" was in quotes, is because it's not much of a "trick" at all to fire a cartridge in a chamber that is not correctly matched. I just noted that depending on the type of extractor and length of the cartridge the possibility exists that it could interfere with the firing pin hitting the primer.
If you would like, I could type the same statement slower for you, and use smaller words also, this might help you understand. I would suggest that you might want to dial down the download speed of your computer, otherwise they will all get there at the same speed.