I use this tool from Arredondo: https://www.arredondoaccessories.com...4901oabhy&gid=
Brownells makes one out of brass: http://www.brownells.com/gunsmith-to...-prod1251.aspx
Usually, the bullet's stuck closer to breech/chamber than the muzzle, so removing it from the muzzle end, tapping towards the chamber is the way to go. Be sure to protect the muzzle, etc.
Here's a YouTube of a guy showing his squib & removal: