Lee
As you can probably guess - I use the 24 as the bullets are long...and the Orange MMP with the .458, and the MMP Blue 40/50..
These all work very well in my Omega, Remington, Knight, and I feel really really forunate - they also load and work well in tne new Triumph.
I have not used very many 'crush rib's' at all because everything else loads very well for me. A few years back i did some sabot testing for MMP and compared the 24 to the 'crush rib' in the velocity test I would loose nearly 200 fps second as compared to the HPH-24 and right @ 100 fps when compared to the 3p. Of course that is for my bore and from a Austin and Halleck.
Here is a pic that I took recently with the Lehighs placed in the sabot...