TexasCHLforum.com

If you really don't know, you need training. Badly.

The short answer is, most guns won't allow you to load the rounds backwards. If they do, magazine won't allow you to insert the magazine backwards. If you insert the magazine in correctly, with the rounds backwards, the gun will jam when the slide is released. I guess it's possible for a round to explode if the primer is struck when you try to chamber a round backwards.

Seriously, find a buddy who knows what they are doing to show you the basics of safe operation. Better, pay a firearms instructor for an hour or so of their time or take an NRA First Steps course.