Hammer49
It really does depend on your bore.
What sabot have you been using?
I have an Omega that is a 2002 vintage and it has a .502 bore - I use use HPH-24 sabots - I would have to hammer a HPH-12 down the bore with a .452 bullet in it.
If the 24 is to tight there is a HPH-3p-EZ load which is the same sabot that the TC bills as their'super glide' to fit their realy tight bores. And then the 'Crush Rib' is the thinnest.
Which sabots might you have on hand?