deerhunter1224
Well, since you have checked the nipple and worked the channel under the nipple - I would fill the area under the nipple with fresh powder insert the nipple and try shooting it out.... if you got a place you can shoot it out.
If you do not want to shoot it out you are back the ball/projectile screw but before you to try to pull it again - screw the remover in as far as you can, hopefully you have the type of remover that fits you caliber so that the screw goes into the middle of the projectile and not off the side. This time before you try to pull the projectile pour a little bit of boiling water down the barrel - this will heat things up and act as a lubricant...
I am really hopping it is not a SST or Shockwave down there - with the polymere tip on them they are really hard to retrieve.
This is the type of remover I am talking about - one with the brass fitting around the screw - this gets the screw near the middle of the projectile
Good luck... keep us informed...