Alright guys,
The .458 ID was wrong, sorry for the mistake, it is .455. These are WW 45 Long Colt brand new in the bag, never been fired. I can take the jacketed .452 250gr Hornady XTP and set in the unflared case mouth with ease. The bullet does have just enough resistance to hold it up. However, even the slightest little touch of the finger and down inside the case it goes. I'm getting ready to run them all through the sizing die and check again.