Here's a question for you guys out there that have been through this before. What am I doing wrong? I was trying to fire formed this Brass so that I can make 410 shells. Here is what I was using -New Winchester Brass that was annealed, Remington large rifle primers, six grains bull's eye powder, filled to the top with cream of wheat. I'm going to try to add a picture here so that you can see the results. In the picture, on the left is a case that bulged, in the middle a new 303 case, on the right a case that had the base wrapped with two turns of masking tape and filled with powder and cream of wheat and fired. Both of these cases are very difficult to extract, had to use pliers. I've not ever fire formed anything before so I could use some guidance here. A 444 Marlin loaded with powder and shot extracts easily and I might just have to use them for my project. I will have to purchase them but I'd rather use the 50 new pieces of 303 Brass that I have. Anybody have any ideas?
