The other issue is that they seal on the bottom with a 45 degree seat, not sure if the LOA on the
die will be the same. This seat will stop the die hard, it will not go deeper.
I am out of ideas. My 45 is at my vacation home, gets only used with a few dies that are the
old style. My 450 uses the same dies as my RCBS, at home, no issues there. I was measuring
the old dies to look into making some dies for the 45, but beyond measuring and sketches, has
not progressed. I need to take a modern Lyman die with me to the cabin and do some fit checks
before I can say any more. Away from home, no access to my sketch with dimensions
right now, either.
Your 45 looks very clean in the top hole, with all paint intact that I can see, so looks normal.
Maybe new style dies in old style lubrisizer? I don't think the old dies were anywhere near
the .721 dimension, but working from memory, so not entirely sure.
What is the ID of the top hole in your 45?
Bill