gt2003
I have not been shooting the .451/230 but I do shoot a lot of the Spreer Gold Dot .452/250's. You can shoot the .451 in which ever sabot that you might normally use to shoot a .452. In most of my rifles that would be a HPH-24...
I am not sure whether the old Knight Wolverine uses a HPH-12 or the HPH-24 but I would suspect it would be a HPH-12...