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Ok, I am ready to ream. But if the .458 Lott is so much better than the .458 Win Mag, why is the .458 Express not even better than the .458 Lott? Why is the .458 Express not all the rage instead of the .458 Lott?

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Answer is because the 458Express is much too long for the vast majority of rifles. As such it never has a hope of becoming even remotely popular.

If you can seat long in your 458WinMag (SAAMI chambers have a long throat) then you'll cut the lead of the 458Lott which has a relatively short throat in comparison. Long throat a 458Lott and you can seat out and grab even more case capacity and really beat the 458WinMag.

The 458AccRel I use has a long-ish throat but its in a standard length action. As a result ... getting anything approaching pressure signs takes a lot of work. That long throat helping to keep pressures 'reasonable'. The fatter case allows it to equal the 458Lott.

Given your using a single shot ... re-shape the chamber with a 300RUM reamer. The 458RUM has been done and it works. As a handloader you can control the headspace much easier and you'll pick up speed to burn ... if you want to use it. Brass is cheap too.
Cheers...
Con

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