OK, the fire channel at the primer end only had a .050 (approx.) opening. I started with a .060 drill and worked up to .125. Now I have a .125" opening to the fire channel. I removed a lot of carbon, but I think I was also removing some metal. But, definitely a much larger opening to the fire channel. I'll brush out the interior or the fire channel and use a nipple pick on the opening to the barrel, which is .030 or below. I'll try it again this coming weekend and see what happens.

Again, thanks to everyone.