I got me some new bullets for my 1911 and I've hit a problem. They are 200 SWC lead bullets and I'm using a Lee 4 die set. My problem is the seating die with these bullets. Some will seat fine and some seem like they catch on something and seat below the case mouth. I've used this set on JHP and they work fine but they don't like these SWC's. Do I need a new insert for the die, perhaps flat instead of concaved? Anybody have a problem like this?