I apologize if this is covered somewhere (I'm sure that's a common way to start a thread), but my search for 40 S&W pulled up zero results. Seems unlikely, but ok.
I cast some hard 200 gr bullets for the 40 S&W using the Arsenal 403-200-WFN mold, and they do indeed measure out to that diameter. Loaded up some rounds and they will not chamber. They are just lubed, not powder coated. Some factory rounds I had measure at .395 right about the case mouth, though admittedly they may have already started to taper.
I figured they need to be sized down, but when I pull up the Lee sizer punch for 40 S&W, it says it's .410". Am I missing something? Do I just ignore that and get a smaller sizer?
The cases are not too long, btw.