True enough. With Australian ADI powder I was getting 2120 fps with the 500 gn Hornady in a 23 inch barrel.
Also played with some 300 gn bonded cores at 2700 fps!!!
These were used on feral pigs and goats and killed real well on chest shots but as you can imagine their expansion rate was huge and penetration was stuff all!
They were really meant for the 45/70.
One morning I had 2 hangfires and one missfire while using these loads so stopped using them after that.
The missfire wedged the bullet just into the start of the rifling and all the powder was still compressed into the case and was unburned.
This 458 only weighed 8 1/2 pound so I can tell you those two hangfires were not a lot of fun and I'm starting to flinch just thinking about it!
My worst failures with this rifle were when using RE7 powder and also when loading some 400 grain bullets.
With RE7 and 500 gn bullets I couldn't get anywhere near the velocity quoted in their reloading data.
One lot of 400 grainers came apart so badly that they did nothing more than create big surface wounds.

That 458 was one of my favourite rifles but I sold it to help fund a double.
Actually one of my long term clients bought it and brings it up on all his top end hunts so I still get to see and shoot it.