So it appears Lehigh is making a 220gr Xtreme Defender for the 450B. One thing I noticed though, they recommend a minimum twist rate of 1:20, but when I played with a twist rate calculator, it shows that a 1:24 should be more than enough. Might have to pick some of these up, even though I still have to work up the 135gr XD's.
https://www.lehighdefense.com/collections/bullets/products/452-450-bushmaster-452-45-colt-454-casull-460-s-w?variant=38489103688